User - role assignment policy

Hi,

We have requirement create new role assignment policy with role "my readwritemailbox" and assign to specific set of users.  below is the screen shot of  MY LAB config, since the implicit recipient read/write scope is  organization ( Not Self ) and isenduserrole set to false. this permission is not applying to the users through user role assignment policy.

I need to create a new role with New-APP readwritemailbox parameter. how to change implicit recipient read/write scope  and set isenduserrole to true.

If I use parent of existing my readwritemailbox role and I am not to change it.

Please let me know if this can be done.