I messed around with the workflow for this a few years ago and I remember at the time the process relied entirely on using RenderDoc to basically extract meshes out of GPU memory. I had forgotten about it and came back recently to try something again that involves using Google Earth data for something, and I was surprised that the process is still kind of clunky and needs external software of some kind (just not RenderDoc anymore). I noticed that Google's finally made an API for getting this stuff "legitimately", but any workflow still referenced some other piece of software that uses this API that did the fetching and exporting for you, so given the lack of a native in-Blender workflow for this, I took a stab at making one myself.
I'm releasing it in 1.0.0 form with two core features: Fetch tiles at a given LOD level and upgrade already fetched tiles to a higher LOD level. I've messed around with some optimization to make it as speedy as I can, and while I feel like I did a decent job it is something I'd like to keep working on to try and make it better. But I wanted to sure up as much as I could and stop the scope creep for a 1.0.0 release so I could at least get it out into the world and then worry about all the iterations I still wanted to make afterwards.
I go into more detail about it in this intro video I made here: https://www.youtube.com/watch?v=Xu1a85uRRIg
I'm distributing the extension here on Gumroad if you find this interesting and worth messing around with: https://0xwhat.gumroad.com/l/blenderearthtools