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You could use a font editor app (like FontForge or FontCreator) on your PC and edit all 4 Bookerly ttf files (you would first have to know how to get them from your Kindle), to make all variants (regular, bold, italic, bold-italic) bolder/darker (and also rename font to something like "Bookerly-Mod"). And then (after copying edited ttf files to font hack folder [Kindle drive > linkfonts> fonts]) just use "font override" (first use the "update the fontconfig cache" button in KUAL and refresh KUAL menu) option of font hack to override Caecilia Condensed.
How to "extract" Bookerly ttf files from you Kindle:
1) Open KUAL
2) Fonts > Font Hack Behavior > Backup default fonts
3) wait for the message on the bottom of the screen to state that it has finished with fonts back up
4) connect you Kindle to your PC via USB cable
5) open Kindle drive > "linkfonts" folder > backups
6) copy Bookerly files, delete the rest
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