Apologies @bhaski, I should have read the question properly!
Model-driven apps use role-based security for sharing and I believe Get App Role Assignments action is only applicable for Canvas Apps.
Another option is to return all users associated to a Security role using a Gallery. For example apply the below to the Items property of a Gallery and set one of the Labels to ThisItem.'Full Name'.
LookUp(
'Security Roles',
Name = "Your Security Role Name"
).Users
And then leverage Power Automate to export that data into Excel for example.
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