Is it just me, or is packaging for Flatpak a nightmare?

I'm trying to package and publish a tool I've been working on, but for the life of me, I'm struggling with Flatpak.

It's a wails app, that relies on webkit2-4.0 and some additional libraries that are not present in any of the Sdks I'm using. (javascriptcore, etc...)

To get those libs, I tried building the app AND webkit itself against the specific platform. But since webkit takes such a long time to build, I'm running in circles.

Welp.