Your answer partially worked for me.
I looked into the install folder of AppGameKit Studio on Linux Steam, but there was no VScode folder. I went to the Windows install on Steam and it was there. I copied it over to the Linux install folder and installed it into VScode. It's all installed, but I have a problem.
When I use the buttons at the top to run or broadcast, ect; I get an error: "Could not find AppGameKit Studio install folder, please set the path in the extension settings."
I know what the path should be, but I don't know how to change the path setting.