Extended mark-up for misspelled words

Is it possible to change way, how LO shows misspelled words? Now LO marks it by adding a red wave under word. I would to get a red background around misspelled word. How can I achieve this?

You can go into Tools → Options → Appearance to change the color of AutoSpellcheck, which will change the color of the underline, but I don’t think it’s possible to change the background.

Related question: In a spreadsheet, can I test if a word is misspelled in a cell, and so have a 0 or 1 in an adjacent cell ? Thank you