The only thing I think is missing is the possibily to cast the audio from the extension to any compatible device (such as Google Home/Google Nest and Chromecast) through the Chrome Browser
Due to the limitations of Chrome extensions, I don't believe this is possible. The only way to perhaps get this to work is to cast your entire desktop with the extension playing, sorry.
The only thing I think is missing is the possibily to cast the audio from the extension to any compatible device (such as Google Home/Google Nest and Chromecast) through the Chrome Browser