Hisense TV (Google TV version) has a "Consumer Electronic Control" Menu w/

Dashboard - Settings(gear) - Channels & Inputs

Did you find it ? (This is a U7K Hisense running the Android/Google 12 OS)

""
Serial/IP Control Port
When set to ON, the serial/IP control port can be used.
""

EDIT: Just set the above to ON.

Scanning the TV's IP I see the following services listed-
airplay
androidtvremote2
(EDIT3: wonder if this opens up any control options androidtvremote2 · PyPI )

and the following ports- (some of which may be not so good to see open !)
7000 file server itself, msdos | file server
8088 Radan HTTP
9001 etlservicemgr | Tor ORPort | ETL Service

EDIT2: Toggling on/off the Serial/IP port and the Control4 port mattered not on these port exposures.