Unsolved How to Create Qt Custom Designer Widget

[Glenomat]

So I wanted to create a Custom Class/Widget that I can use every time without always creating an extra Header and Cpp file for it.
It's a clickable QLabel but I can't get it to work. I used "Qt Custom Designer Widget" under
New->Projects->Other Project->Qt Custom Designer Widget. I can't build it and I don't know how I could add it as a plugin even if it worked.

I read docs now for so fucking long... i just want a new widget...