Yeah, you can do this by setting up guides, or use the grid function.
What is really missing from Gimp is a Macro function for recording actions. The Gimp devs say use script-fu. Reads like sanskrit to me .
However resizing a text layer is only a couple lines of code that you can use in the script-fu console.
(define image 1) (define layer (car (gimp-image-get-active-layer image)))
(gimp-text-layer-resize layer newwidth newheight)
That can go in script-fu "boiler plate" (attached) and it might work like this
https://i.imgur.com/XxEF9qA.mp4Usual guarantee - absolutely none (it is a bit flakey) For those 3 brave souls who downloaded, a slight mod to make it less flakey