I know this is a very old thread, but I just came across it while looking for a similar solution and thought I would suggest another way to do it in case it comes useful to someone.
Another quick way to create the numbers sequence mentioned above if you don't want to use scripting is by using Microsoft Excel.
Just type the first 2-3 blocks (vertically or horizontally) of how you want the sequence to start (3,2), then select the blocks and drag the selection rectangle from the side and it will fill the rest of the blocks automatically with the numbers according to the same sequence (3,2,1,0,-1,-2...)
Then copy the text into Affinity Designer.
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