Open popup with text in the navbar

Is it possible to submit text to the popup’s navbar from a component?

- component: oh-button
    action: popup
    actionModal: widget:whatever
      label: text in header

I don’t think so, at the moment. The sheet and popup have a title that can be filled with a config label, but that context is separate from what is supplied by the actionModalConfig property. It is used only internally for MainUI modals, as you have shown. I just don’t see anyway of accessing the component context directly via the actions configuration.

You can build a clone of the modal with a title yourself, of course, but that’s the only option I see as things stand right now

The addition of an actionModalTitle parameter would certainly be an elegant solution to this problem.
It might be worth a feature request or PR.