If you scroll to the bottom of that GitHub Link, you'll see there's some support in GeoServer.
This Neo4j Spatial in GeoServer page gives an idea of what it looks like in GeoServer.
However that page is 6 years old - the last update on the readme.md on the GitHub page is fairly recent so I suggest you use that instead :)
Not familiar with Neo4J so not tried this myself. Configuring it seems to involve copying the Neo4J Spatial JARs into your GeoServer install.