Dokan User Role Capability - help

I don’t want “Dokan” to add a new user role. I want members with pre-existing user roles to be able to use “Dokan”. how can I do? who can help me?

I used role management plugins. but we can’t use “dokan”. I make the user role “vendor”. The bug has improved. Dokan’s default role is “Vendor / Seller”. I don’t want the role of Vendor to be created. I want to use “Dokan” with a pre-existing “sample_role” user role.