Markdown natively supports callouts. See the Obsidian documentation.
Types:
note— pencilabstract,summary, ortldr— clipboardinfo— “i” symboltodo— check marktip,hint,important— firesuccess,check,done— open check markquestion,help,faq— question markwarning,caution,attention— triangle attentionfailure,fail,missing— X crossdanger,error— lightning boltbugexample— bullet listquote,cite