Adding a dropdown column in an editable data grid with constraint.

Hi All, I am using an editable data grid to show the records from an entity and that entity is having association with Administratoin.Account entity. In Grid, I am having a column to select the account for each record. The issue is, the column shows a dropdown with all users but, I want to show the users related to particular user role. How can I achieve this in the data grid.

Thanks in advance.