AR transaction saved search based on role

Summary:

I need to show a saved search based on the role and username of the logged user

Content (please ensure you mask any confidential information):

Hi all,

in the Manage Transactions page of Receivables I need that all and only users who belong to a custom Role have a saved search by default. Furthermore, it should be an advanced search which always has the Created by parameter equal to the username of the logged user (I tried to populate the field with Expression Language but it doesn't seem to be possible).

I also tried using a Sandbox with Page Composer and setting the Category to the role, but I cannot activate Page Composer on the search page this way because I receive this warning: