If yours is a new Jayco Jay Feather, and there is an outside mount, than there should be a tv mounting plate included.
In our 2022 Jay Feather 24RL, we found the mount under the bed. If not there I would contact your dealer.
It should look like the pic's below.
There is a company name on it, Ramco Engineering, with a part Moview # MS1575
US Navy Vet
Retired Law Enforcement
2021 Ford Ranger Lariat
2022 Jayco Jay Feather 24RL