Similar to this previous question, I have been slowly working through some PDF puzzle books. I will shortly come up on KenKen puzzles (called TomTom in the book, but the format is the same). Here is an example from the Wikipedia article:
I can very easily draw the cages by thickening some borders, and the cells which have only solution-numbers should be simple as well. However, I'm not sure how to put the problem-numbers (11+, 20x) so that they share a box with a solution-number. I would prefer for the solution-numbers to look the same in all cells but if I have to modify them somehow to make them share space with problem-numbers that is fine with me.
Google Sheets is non-negotiable. I am not willing to use an inserted drawing, as suggested by a comment to the previous question. Within these constraints, how do I transcribe a KenKen into a Google Sheets as simply as possible? Solutions which take up less cells of of the underlying Google Sheets are preferred.