List view permissions for two users

I have made a DocType that is such that is basically an Employee Giving Feedback to the Supervisor/Senior
I know that in Role Permissions Manager if I select “Only if Creator” only the one who made it can see it but I need to make a script where even the supervisor (that username and email will be mentioned in the Doctype’s fields) and I need to make sure that specefic user and the creator is able to see the Doctype

Thank You

use the share button to share the record maybe? Then only the person - supervisor in this case along with the creator of the record will be able to see it.