Here on the StackExchange framework we have a nice feature, which is apparently called "Keyboard Glyphs" (cf. https://meta.stackexchange.com/questions/5527/keyboard-glyphs):
Is there a way (e.g. with an Add-On) to do the same in Google Docs? I browsed the Add-Ons but did not find anything, maybe it's hidden somewhere different (e.g. in a Code Formatting Plugin).