Custom UI components

[LukasBenner]

In a Discord support thread someone asked:

Hey guys, I am new to ELSA world. but i am wondering if we can create custom UI components (new web components, for example select/multiselect, interactive UI inputs) so we can provide the inputs in the designer itself. is this possible to add/alter the current activities to do such things?

or even write my custom components in a framework like react and inject them to be components in ELSA?

@sfmskywalker said that this already possible but not documented yet.