TiVo seems to provide other streams such as Netflix so I see no reason to doing it for others as well. It is simple enough to resolve other problems. ThanksThat is 99% not likely to happen, TiVi has almost never added apps for streaming services, and barely support the apps they have.
You can get BritBox through Amazon if you desire.
I currently have Paramount+ through Amazon, as neither my TiVo's or TV can install the app.