Puoi ottenere ciò di cui hai bisogno con uno script come questo:
declare @RoleName varchar(50) = 'RoleName'
declare @Script varchar(max) = 'CREATE ROLE ' + @RoleName + char(13)
select @script = @script + 'GRANT ' + prm.permission_name + ' ON ' + OBJECT_NAME(major_id) + ' TO ' + rol.name + char(13) COLLATE Latin1_General_CI_AS
from sys.database_permissions prm
join sys.database_principals rol on
prm.grantee_principal_id = rol.principal_id
where rol.name = @RoleName
print @script