Trigger a policy on the removal of a role or right ?

Hi,
In an object policy of type event, is it possible within the associated rule to detect the removal of a specific role or right from a multivalued attribute?

For example, we would like to trigger a rule when a particular role or right is revoked from a user and react accordingly (e.g., update another object or attribute). Since attributes such as roles and rights are multivalued, standard functions like hasAttributeValueChangedFromTo() cannot be used directly to detect the removal of a single value.

Is there a specific function or recommended approach to detect the deletion of a specific value within a multivalued attribute in this context?

Thank you in advance for your help.