how to add subject to rolebinding or clusterrole binding?

[alexandershelega]

Hello how can i make modification in generates bindings?

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  creationTimestamp: "2021-10-19T13:51:31Z"
  labels:
    generated_for_user: username
  name: username___template-namespaced-resources___test___monitoring
  namespace: monitoring
  resourceVersion: "62934390"
  uid: 2b36d436-0b65-493c-822a-45d44d98352f
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: template-namespaced-resources___test
subjects:
- kind: ServiceAccount
  name: username
  namespace: permission-manager

i need to have possibility add group which will based on username

- apiGroup: rbac.authorization.k8s.io
  kind: Group or User
  name: username