Yes JioLink is also an option, but not sure if watching Tv will use up monthly data pack
Jio apps can be used only with jio network, so the android TV app will be blocked once the GigaTV is launched.
JioFI or any Jio Sim inserted on mobile too Jio Network only and moreover for Login Jio Account is Mandatory even in the beta app and official app might be launched strengthening all these aspects.