Chromecast audio *from* Android *to* PC?

[Wizek]

This app is nice to stream from PC to Google Home, but I wonder if it could work to cast from Android to PC as well?

There exists this old and abandoned project:

https://github.com/dz0ny/leapcast
dz0ny/leapcast#130

They say that their deprecation happened because v2 of the Chromecast API's receiver needs to have some kind of hardware key. v1 did not need that. However very few services are compatible with v1. I wonder what this project uses? Still v1? Or has it managed to leap over to v2 bypassing the lack of that key somehow? Or perhaps that key is only required to be a receiving device, not a sending device?

[SamDel]

This project uses the low-level Chromecast protocol as described here (v2).
I don't know if all parts of this application, like capturing system sound etc., will work in Android. The communication with the devices should work in Android as well (as long as the Chromecast API stays the same).

I don't know anything about leapcast. It looks like that project was using other apps/apis on the Chromecast.