geolocation_views: show combined data in tooltip
You're incredibly close. What you need to do is incorporate the objects related to the place into the place view itself.

You do this by means of a Relationship. You can find that, when you're editing the view, in the right-hand Advanced column. When you click Add, you'll see something like Entity Reference: Referenced Entity, A bridge to the Content entity that is referenced via your relate field.

This puts the JOIN in the FROM clause of the underlying SQL query.