1. Being able to paint maps doesn't require GeoAnalytics to be licensed. However, the Analytics functions, those things you would do in a load script do. 

2. Here is a support article specifically about loading GeoJSON files. 

3. I have attached a ZIP I put together for a webinar years ago which provides hands on level details on multiple GeoAnalytics functions so you can see other use cases to understand what GeoAnalytics provides above just drawing and painting visually. One of the topics is loading an ESRI Shapefile. Just calling that out here in case future #qlikkies happen to stumble upon this post and are dealing with ESRI instead of GeoJSON.