Custom UI.Combo selector?

[featherice]

Maybe i'm dumb or unaware, but i can't find a way to build a custom menu with comfybox dropdown ui nodes. My goal was to have a number of subgraphs with controlnet preprocessors wired together, so i'd be able to select a type (edge, depth, pose, etc.) and after that a variant (for edge that would be scribble, lineart, hed, etc.). I know how to do it with radio ui elements, but most convenient would be a pair of dropdown ui elements.

I quickly found out that dropdown can only be populated via some other element and then i actually did what i needed manually by changing ui.combo properties. Problem is, they do not persist through save/load and i couldn't find any node which can change properties. So, is this a bug? Lack of feature? My blindness?

[featherice]

If anyone wonders, it is not currently possible, but planned feature. Confirmed by dev