Increase character limit on Kanban cards

The 6000 character limit on Kanban boards os to limited for my Design Briefs.
I would like double dot 12k.

My typical layout is shown in the attached image.



I really don't understand why Miro team restricts characters in every kind of text input they have. The same applies to tables….

The current character limit makes kanban unusable for me. I run into similar issues with regular text boxes as well.