Dynamic person assignment based on the person field that changes

Currently we can build an automation that reads as the following image
Screenshot 2022-05-03 at 12.21.39 PM

Currently the someone field that is highlighted can only choose between a predefined list of persons. Is it possible to enhance this so that it can dynamically pick from a pre-existing person column as part of the board?

it is a very important funcionality, specially if, we are using Kanbam methodology