For my part, I'm late to the game --- I used Google's LLM-enabled notebook to generate some sample DXF files early on, but I mostly hack away and copy-paste from Stackexchange and so forth --- flet.dev hitting 1.0 and offering an online studio did have me buying tokens and ultimately a subscription to make:
https://studio.flet.dev/apps/bicQWc3Aul
but for a long while it wasn't running and I was out of tokens, so I coded up:
https://studio.flet.dev/apps/46tp8GPq9g
while waiting for my next month of tokens to show up by copy-pasting and in a couple of instances asking Copilot about errors.
Currently trying to work out how to get the previews in the first app to look right, maybe adding an optional toolpath preview to the latter, and how to get a larger and more complex version up-and-running with an architecture I can wrap my head around using a toolchain I feel comfortable with (rather than a browser app, my typical development chain is local driven by a .text file: https://github.com/WillAdams/gcodepreview using a Literate Programming system).