Create Dropdown Column from Items on another Board

We would love to see the option to create Dropdown Column values based on items on another board.

We use dropdown columns on multiple boards with the same values (approx 50 names). We would like to be able to only maintain one list (or board) that is updated to all those dropdown columns.

I know there is the option to copy the column, and that was really useful in setup, but it would be good to have a streamlined way of adding extra value(s) to those dropdown lists.