Cannot print value that is returned from Controller Laravel

My view doesn't recognize the variables that are passed from controller to view for printing.
My flow of getting the result on view : model gives the result from db -> controller then checks them and puts them in different arrays -> on form submit, js is called and ajax is used to call the route where I get the results and then I want them to be printed in table format.
There is no issue in queries. The numbers in the response are perfect. But I can't print them on view. My view doesn't recognize the getComptage arrays. Even var_dump(isset($_POST['rechercher'])) doesn't return anything. I've been trying to solve this for 2 days but nothing helped.

Form:

<h2 class="planning-stats-header">
    <p>{!! __('planning.planning_stats_header') !!} </p>
    <p>{!! __('planning.planning_stats_subheader') !!}</p>
</h2>

<form method="POST">
    @csrf
    <table class="table" id="table_recherche" cellpadding="5" cellspacing="5" border="0">
        <tr>
            <td>Date debut: </td>
            <td>
                <input type="text" id="datepickerdebut" name="datedebut" value="">
            </td>
            <td>Date Fin: </td>
            <td>
                <input type="text" id="datepickerfin" name="datefin">
            </td>
        </tr>
        <tr>
            <td align="center" colspan="4">
                <input id="rechercher" type="button" value="Rechercher" name="rechercher">
            </td>
        </tr>
    </table>
</form>
<div id="contenu">
    <table class="table table-striped table-condensed table-hover table-responsive">
        <thead>
            <tr>
                <th>{!! __("planning.nom") !!}</th>
                <th>{!! __("planning.matin") !!}</th>
                <th>{!! __("planning.midi") !!}</th>
                <th>{!! __("planning.soir") !!}</th>
                <th>{!! __("planning.recurrent") !!}</th>
                <th>{!! __("planning.astreinte") !!}</th>
                <th>{!! __("planning.intervention") !!}</th>
            </tr>
        </thead>
        <tbody>
                @foreach($req_personnes as $req_personnes)
                    <tr>
                        <td> </td>
                        @php
                        if(!isset($_POST['rechercher'])) {
                            for($i=0; $i<6; $i++) {
                                echo '<td>2</td>';
                            }
                        } else {
                            for($i=0; $i<6; $i++) {
                                echo '<td>'. $getComptageMA[$i] .'</td>';
                                echo '<td>'. $getComptageMI[$i] .'</td>';
                                echo '<td>'. $getComptageS[$i] .'</td>';
                                echo '<td>'. $getComptageR[$i] .'</td>';
                                echo '<td>'. $getComptageA[$i] .'</td>';
                            }
                        }
                        @endphp
                    </tr>
                @endforeach
        </tbody>
    </table>
</div>

Controller :

public function getStats(Request $request) {
      $calendrierObj = new Calendrier();
      $utilisateurObj = new Utilisateur();
      $hnoObj = new Hno();
      $utilisateurs = $utilisateurObj->creeTableauSGI();
      $req_personnes = $utilisateurObj->getPersonnes();
      if($request->post('date_d') && $request->post('date_f')) {
          $ddebut = $request->post('date_d');
          $dfin = $request->post('date_f');
          $interventions = $hnoObj->creeTableauInterventions($ddebut, $dfin, $utilisateurs);
          $getComptageMA = [];
          $getComptageMI = [];
          $getComptageS = [];
          $getComptageR = [];
          $getComptageA = [];
          $intervent = [];
          for ($i=0; $i<count($utilisateurObj->getPersonnes()); $i++) {
                $sgi = (string) $req_personnes[$i]->identifiant;
                array_push($getComptageMA, $calendrierObj->getComptage($sgi, "MA", $ddebut, $dfin));
                array_push($getComptageMI, $calendrierObj->getComptage($sgi, "MI", $ddebut, $dfin));
                array_push($getComptageS, $calendrierObj->getComptage($sgi, "S", $ddebut, $dfin));
                array_push($getComptageR, $calendrierObj->getComptage($sgi, "R", $ddebut, $dfin));
                array_push($getComptageA, $calendrierObj->getComptage($sgi, "A", $ddebut, $dfin));
                if (array_key_exists((string) $req_personnes[$i]->identifiant, $interventions)) {
                    array_push($intervent, $interventions['identifiant']);
                }
          }
          return array('req_personnes' => $req_personnes, 'getComptageMA' => $getComptageMA, 
              'getComptageMI' => $getComptageMI, 'getComptageS' => $getComptageS, 
              'getComptageR' => $getComptageR, 'getComptageA' => $getComptageA, 
              'ddebut' => $ddebut, 'dfin' => $dfin, 'intervent' => $intervent);
      }

JS:

// display current and previous date on textbox
$(document).ready(function () {
    var todaydate = new Date();
    var day = todaydate.getDate();
    var month = todaydate.getMonth() + 1;
    var year = todaydate.getFullYear();
    var datestring = day + "/" + month + "/" + year;
    document.getElementById("datepickerdebut").value = day-1 + "/" + month + "/" + year;
    document.getElementById("datepickerfin").value = datestring;
});

$('#rechercher').click(function (e) {
   var headers = {
            'X-CSRF-TOKEN':'<meta name="csrf-token" content="">'
        };
   e.preventDefault();
   e.stopPropagation();
   var d = $("#datepickerdebut").val().split('/');   //dd/mm/yyyy
   var debut = d[2]+'/'+d[1]+'/'+d[0];
   var f = $("#datepickerfin").val().split('/');
   var fin = f[2]+'/'+f[1]+'/'+f[0];
   
   $.ajax({
        url: '/planning/stats/statistique',
        method: 'POST',
        data:
            {
                myFunction: 'getStats',
                date_d: debut,
                date_f: fin
            },
        headers: headers,
        dataType: 'html',
        async: false,
    });
});

Response that I'm getting :

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