As I told you earlier,TCL's extensions are user-contributed, and if an extension isn't available in the APP browser, most users probably don't have a need for one, though you're welcome to make your own zcm.tcz if you do.
In most cases, if the software developer does not provide the source code, they will also provide binary packages (usually compiled) and individual distribution packages.
I've told you about ZCM(ZoomCloudMeeting) before, you don't actually need to compile ZCM, you just need to download its binary package and add the corresponding soft library dependencies. I don't know why you don't do this, but in my tests I was able to run ZCM on TCL.