Allow a role access backend

Hi Sitefinity geeks!

Is there any possiblity in Sitefinity to allow a role(default  role provider) access the sitefinity backend?

I saw the checkbox "allow USER access the backend". But it's not quite what I need, because I use external IdentityServer(so not creating users in the backend).

I tried to check all checkboxes from Permission section related to a role, but still, after login it is displayed - Admin Rights Needed message.

I could not assign the current users to any of the roles of AppRoles provider(only the Default one).

Thanks a lot for help!

PS: I'm using Sitefinity 8.0.