Adds an Asset Group with the jump_group_id given in the request body to a group policy with the {id} given in the path. Optionally the request body can specify an Asset Role by its jump_item_role_id, otherwise the jump_item_role_id will default to 0 which means "User's Default". Optionally the request body can specify an Asset Policy by its jump_policy_id, otherwise the jump_policy_id will default to 0 which means "Set on Assets".