Filtering related schemas on reference fields


I have an entity/schema defined called Users, which is a list of Users. Each user has a role field. Now I have created another schema called Groups and I would like to create a field which references Users but only those who are admins (so role=‘Admin’).

Is this possible to create the reference field in the Groups schema in such a way that when the users then create a new Group and want to select a related User on that field they will only be able to select those who are admins? So basically is it possible to apply a filter to the referenced schema?

The only option at the moment are custom editors.

There is a sample for that:

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