You can download it as APK long as you have developer options enabled. Google tv plus.apk download it. then go into your phone, settings , about phone, tap build number 8, then go i to developer mode, enable unknown sources. your download with then install when you go back and click on it from the drop down menu.
Samsung TV plus is now available for extended list of devices. I just downloaded for the Fold2 which was previously not available. You can now get yours from the Galaxy Store