Tvheadend

In the last few months I have acquired a TV service from my ISP. The service comes as an App installed on an Android TV Box. The Box is connected both at the internet and an antenna and presents both free to air and IP channels from the same app. I want to ask if I could connect the Android TV Box to my TVHeadend Server via HDMI capture card would it work? Could I have full usability in changing channels i.e? Has anyone done something like that? I'm Just asking because the cost of a capture card is big enough to buy one just for the test and risk not working in the end. The service is WindVision from Wind Hellas and the TV bos is the Technicolor UZW4030WNH (Pearl.