Eloquent: need to return also "distance" from this query (coordinates)

I'm trying to find a solution to my problem but could not find anything useful. I need to get the "distance" variable that has been created by this query along with all the other data (user, userData, offers, and so on). I need to print the distance in 'km' within my view for every record i take. Is there someone who can help me please? Here's the code and hope its enough. Thanks a lot

            if(property_exists($params, "lat") && property_exists($params, "lng")) {
            if(null == $params->lat || null == $params->lng) {
                //don't use coordinates
            } else {
                $radius = $this->coordMaxRadius;
                $query->whereHas("userData", function($q) use ($params, $radius) {
                    $q->selectRaw( \DB::raw("
                    ROUND( 6371 * acos( cos( radians($params->lat) ) 
                      * cos( radians( lat ) ) 
                      * cos( radians( lng ) - radians($params->lng) ) 
                      + sin( radians($params->lat) ) 
                      * sin( radians( lat ) ) ) ) AS distance "));
                    $q->having("distance", "<", $radius)->orderBy("distance");
                });
            }
        } 
............. later in the code.....
$query->with("timeSlots.days", "timeSlots.time", "userData", "university", "faculty", "user", 'userData.feedbacks');
.............

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