How use repeaters with MorphToMany relationship with pivot columns

I have this models: weekDay, Amenity, Braches and Mall, and a table morthtoMany schedules this table have the fields: week_day_id, opening_hour (time field), closing_hour (time field), schedulable_type (strign for the morph model), schedulable_id (callable id), I need to create a multi select, where I can pass the week_day_id,