This been a request over many years and controversial, in a group riders can go faster and take turns to push the pace as solo riders have only themselves and their bikes.
Here is the complication is it a Solo KOM when a group breaks the KOM on a timeline !!
The slowest rider of the Group uploads their ride and sets a new Time and sets the KOM(Solo), half an hour later other riders upload theirs and get the KOM(group) as there is more than one rider, as riders upload, the KOM time may change as I have seen this happen and number of people get the KOM on their activity achievements. Ideally once a group KOM (>1+) second rider uploads the first rider activity achievements is reprocessed for solo & group KOM identity.
What I would like to see is on the segment leaderboard an additional column(subscriber feature) of solo so that you can filter on groups or solo.
There is another feature which I see as Group Sprint, I will raise that as a separate post.