In a previous opportunity the developer Bandai Namco ruled on the possibility of seeing a port of Soulcalibur VI for Nintendo Switch, confirming that it is something you do not have at the moment, although it would seem "great to do it."
These statements were made in August 2018, and unfortunately after two years of success in the current generation of consoles, there are still no plans for a version of the game for Nintendo Switch; and apparently they haven't even studied the possibility. This was confirmed by the very producer of the game, Motohiro Okubo, in an interview with Soulcalibur Community in the EVO Japan 2020.
You can find his words about himself Soulcalibur VI will reach Nintendo Switch then:
If I have to respond seriously, I think I remember saying earlier that we are not sure that I can port the game for Nintendo Switch. I said we had to examine and analyze everything, and well … When I said that, I still didn't know if we would have a Season 2 and now that we have one, I will be totally honest in saying no. I don't have time to study that (the port). Basically, the situation has not changed much.