Desired:
Domain.com/rest/latest/admin/groups/more-repositories?context&filter

Behavior:
Given a context of a groupname, return all projects and repositories that the group has access to , as well as access levels.

Workaround:
For all projects/repositories in instance, iterate and request
/rest/api/1.0/projects/

{projectKey}/permissions/groups
and for each repository
/rest/api/1.0/projects/{projectKey}

/repos/

{repositorySlug}

/permissions/groups?filter