Image metadata 'document properties' character length

The scenario: Using stable diffusion and want to save prompt, negative prompt and main settings in the image file. Filename limit of 250 characters is not enough and the metadata fields 'Description and Instructions' seem to have about a 250 character limit as well.
Is it possible to increase the length of the metadata fields please. (i'll tag this as a feature request)

Update. My bad, the limit on the fields was being set by my button, not sure what the actual limit is, but with the clipping off it will easily do >12k characters.
(You can delete this post, unless you think it might be useful to know)