I’ve been pondering about this as well, and i’ve encountered there is a way to do it individually for each panel (which is adding it to the panel list) but I can see that being very tedious.
However, there was a suggestion of copying the using the JSON of the dashboard that you would like to duplicate(as a foundation) but the trouble I’ve encountered with that is it overwrites the previous dashboard due to the dashboard id?
Discussion mentioned
Not sure how helpful any of this would be to you but I’d like to know if you’d managed around this