Limit to number of cards in card view for Kanban board use
I would like to use the card view of my spreadsheet as a simple Kanban board, but I need to set a limit for the amount of cards that each column can contain (or at least get notified when a set threshold is crossed).
For example, if the Kanban board is designed to show my projects sorted by their status (like "not started", "in progress", "done"), I would like to set up a threshold so that, if there are already 5 cards in the "in progress" column, a further card can't be created (or moved from another column) in there. Whether I am prevented from adding a card in the column or that I am only notified that the set threshold has been crossed, that's okay anyway.
Is there a way to do it?