How to model access groups?

Heres a little use case on access groups for resources. I'm not sure whether it makes sense to model the access group as agentRelationShip or as an group agent:

# Example:
# Anna is allowed to do bank transactions:
#   – Anna is in the group of contributors that is allowed for cash transactions (custodians-cash)
#   – Solawi transfers custody of wallet to custodians-cash

'@context':
  - https://git.io/vf-examples-jsonld-context
  - wd: https://www.wikidata.org/wiki/
    solawi: https://solawi.example/
    anna: http://anna.example/

'@id': https://lab.allmende.io/yova/bachelor/-/raw/master/diagrams/process%20level/examples/solawi-access-groups.yaml
'@graph':
  - '@id': solawi:bae0b84f-d84c-4d1d-afd0-c88f16b4c421 #custodians-cash
    '@type': AgentRelationshipRole
    roleLabel: is custodian for cash
    inverseRoleLabel: cash is in custody of

  - '@id': solawi:4f496033-f366-484d-99a0-14992320fb76
    '@type': AgentRelationship
    subject: anna:
    relationship: solawi:bae0b84f-d84c-4d1d-afd0-c88f16b4c421 #custodians-cash
    object: solawi:

  - '@id': solawi:8e837319-2f5b-4b69-9d45-155688bd5c21
    '@type': EconomicEvent
    action: transfer-custody
    provider: solawi:
    receiver: solawi:groups/custodians-cash
    resourceClassifiedAs: wd:Q131740 # wallet
    hasBeginning: 2021-03-01T08:00:00-1:00
    hasEnd: 2022-02-28T17:00:00-1:00

It seems that vf:name is missing for vf:RelationshipRole to model the grop name (custodians-cash in this case)

related to #138.