Restricting Docs with User Permissions based on Table fields

Frappe Framework App Development
1

Hello Everyone,

I have Request DocType & Branch DocType

Created a user who has access to only 1 branch (Achieved this by using User Permissions)

Now created a Link field in Request DocType pointing to Branch DocType

By this, branch user will have access to Request of particular branch only.

I would like to share the Request with multiple branch users. How to achieve this?

Tried creating a child table and converting the link field to table field still not able to achieve