Do "chess engine in the cloud" services exist? And if so, what interfaces can connect to them, and how do they do that?

I want to analyze with Lc0, but I don't have a computer with a GPU; I could rent one for a short time period at various cloud providers, but then I don't know what GUI I could use to talk to an engine running somewhere on the Internet.

Do e.g. Chessbase, Scid, Aquarium etc have a feature to work with engines running in the cloud?
Chessbase has this feature for subscribers. Basically you can analyse your games using their cloud based engine. If you have a powerful machine yourself you can also "rent out" your engine. More details here.

Here is an older article which includes a video explaining how it works and walks you through the process.