Show Updated Date - if missing, then Published date

Hi,

I'm using a page hero to show post meta data. One of the things I like is to show the 'Updated on 28 jan 2023' line.

This works fine. But when I freshly publish a post, it does not have an updated date but only a publish date. The publish date than does not show and the meta data returns: Updated On ... (empty)

I would like to show the update date when available, and only the publish date when update date does not exist.

Can we achieve this using a dynamic text type in a heading block?

I saw below post but it does not make use of the blocks

https://generatepress.com/forums/topic/show-published-date-if-modified-date-is-not-available/

I current experience this at: https://gorilla.bi/power-query/fiscal-calendar/

Thank you!
Rick