This is a request for an enhancement to the Recipient resource type.
I am currently working on upgrading a service that uses EWS and expands known groups out into the individual recipients within that group, then performs an operation for each individual recipient. With an upcoming deprecation of EWS API, we want to switch all operations to the Graph API.
If possible, I would like a property added to recipient that indicates whether it is an individual, or a distribution list (i.e. a group). Knowing if a recipient is an individual or a group, will allow me to identify which group recipients I need to expand out into individual recipients to perform the operation on.