Laravel - Calculated query with join inside it

I'm beginning with Laravel ORM Eloquent and i would like to do a query with some calculated fields that depend on 2 tables. So i have to do a subquery inside the calculated query but i don't know how to do that with the Eloquent query builder.

Example of query that i want to do :

select * , 
(select activites.id_activites from activites inner join insc_ses on insc_ses.id_activites=activites.id_activites where id_session=1 
and insc_ses.id_inscription=inscriptions.id_inscription) activite_session1, 
(select activites.id_activites from activites inner join insc_ses on insc_ses.id_activites=activites.id_activites where id_session=2 
and insc_ses.id_inscription=inscriptions.id_inscription) activite_session2, 
(select activites.id_activites from activites inner join insc_ses on insc_ses.id_activites=activites.id_activites where id_session=3 
and insc_ses.id_inscription=inscriptions.id_inscription) activite_session3 
from inscriptions

Is that possible to do ?

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