is there any shortcut like CTRL+B but for highlighting text in some way like with gray box or color

[inikishev]

I looked in two places, shortcut settings, and https://github.com/TriliumNext/Docs/blob/main/Wiki/keyboard-shortcuts.md, but neither have CTRL+B, so maybe they also don't have that other highlighting shortcut that I am looking for

[Nriver]

You can use the script provided in this comment to customize your shortcuts.

Additionally, check out the awesome-trilium repository for more useful resources.