Welcome!
To output a valid video signal, you need at the very least a sync generator module and a video encoder module. Unfortunately there are no currently available modules you can purchase that do this outside of keeping an eye on the used market. I am aware of someone who has a Visionary Video Sync Generator and Color Video Encoder for sale if you’re looking for one, DM me.
This is a good thread for getting a better handle on what’s necessary for modular video synthesis: Getting started with video synthesis