One of the goals is to also gather things which have already been posted by community members. Always retaining the copyright they have posted, as for example:
Docs - ZigZag indicator for live trading
If you believe you have something to contribute, post it and it will be considered, just like anything else, but picked up things (initial idea) will be mostly related to indicators.
More explicitly, in colab you can modify your pip installation source files by clicking on the error message, save, and restart the env. I also used the same trick and it worked for me. This matplotlib.use line in the init should probably be in a try catch since everything seems to work without it.