Contributing my two cents.
Exporting to Revit can be more involved than exporting the geometry.
The rvt file format is closed and there’s very little you can do without having Revit.
Open Design Alliance has BimRv SDK to help with external Revit access.
IFC is an open standard for BIM information exchange which has seen increasing adoption. Revit supports importing IFC formatted files, but I have come across some issues with that sometimes. (Someone out there also has an IFCLoader for three.js).
If you decide to write an exporter for your format to IFC that would be pretty cool. The geometry is only a representation for Revit. You would need to export a bunch of metadata from your 3D application besides the geometry to make it “smart” enough for BIM/Revit.
Revit does import a bunch of 3D formats but that is only a workaround as the those elements are “dumb” in the Revit world and you can’t really do much with them even after they are in Revit.