Custom action for bottom nav

My app layout is very simple with only three icons in the bottom nav.

I would like to write a custom action in which ‘Set column values’ populates a few fields in the corresponding Users data sheet. This is straightforward for buttons or when navigating among various screens or tabs.

How do I create an action for something in the bottom nav that is more elaborate than the default ‘go to tab’ action that I assume is happening now?

Not possible, I’m afraid.

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Bummer. Thanks for saving me from days of trying to figure it out.