For groups that have donated for the extended webfeatures (https://ls-rcr.com/shop/?p=groups), they are able to see graphs for each member they have for most of the statistics we track. These graphs are visible when managing a member in the GCP.
See example of 3 graphs (out of the 12), including playtime of my statistics in Blackouts:
Not sure if you were aware of this, so I'm keeping this open just in case.