The one I had didn't have any obvious way to remap the button. Across several years of ownership, I probably spent a total of an hour looking for such a capability. Certainly more than I did investigating what "Bixby" is.

Now I have a ulefone, a budget brand with no particular name recognition. It has a button in the same place, with an easy way to map it. And it cost a quarter of the Samsung. shrug