QuoteIt would be great to be able to 'bake' the TG texture onto some vector displacement map, but I don't think that's possible yet. At least I don't know about it.
You don't need to bake a color texture to a vector map, that would be purely for displacement.
As mentioned, Terragen's procedural textures are very detailed and best left for Terragen to render. In order to get anywhere near the same level of detail in Terragen from an exported map it would have to be huge. Or least have some sort of facility to break the terrain down into more manageable UV tiles (also known as UDIMS) to export say a number of 4K maps to cover the terrain.
I would export a terrain (as an obj) to another 3d app as a guide for animation only. My tutorial channel on You Tube might be a good place to start to get some ideas on this kind of pipeline. (
https://www.youtube.com/user/cristouk )
And even though it's possible to export a vector displacement map of a terrain from Terragen to a 3d app, the main intention for that workflow was to export the map to a sculpting app like Mudbox or Zbrush - sculpt some features by hand and re-import back to Terragen to render.
Just my 2 cents worth... :-)