Yeah, but that's on the way out, in my query. I'm trying to find a way to have a calculated field auto-update based on the values in other columns. This is just a simplified example of that.
If you use the "Mapped value" setting of your column you should be able to display the calculated values immediately. Those values then also get registered in the table's columnMappers property which you can use for your update. How exactly to reference that depends on what kind of DB you're using though - would you mind sharing more about it? display_calculated_values_in_table.json