Trigger custom interactions/animations

It depends if you want to attach the "super yawn" to the TV object or to your Sim.
If you want to attach it to the TV object, you could easily add it into the super affordances of the TV's object tuning so you just had to deal with XML.

If you are to add it to your Sim, you would ideally need to inject your XML affordances to the Sim via python. Which is a bit more advanced.

You could of course go the python route with the TV object as well and inject the interaction to the super affordances of the object so you wouldn't have to do an override, but in terms of keeping it easy if you are just starting out with this, I think it is probably smarter to start off with an override mod to get a grasp of the basics.

In terms of adding that animation, you would first have to create a custom Animation State Machine and a custom Animation Tuning.
Set up the ASM and Animation Tuning so that the ASM is referenced in the Tuning correctly.
With some searching on this forum you should be able to find something that touches on this, like this old thread.

Then start extracting some SuperInteraction tunings from Sims4Studio, find a basic one that doesn't do all that much apart from playing an animation. Strip away the stuff you don't need for it,
use the custom ID for your new Animation Tuning in the <factory> animation bit in the Interaction.

That's the general gist of how to go about it. I'd provide some better examples if I had my other computer in front of me. But hopefully this should be able to nudge you in the right direction at least.

Best of luck