Numbered list in Notes

Nope - at least as of Creo 4.

No numbered lists, no bullets, no spellchecking.

Please post a product idea about this.

Creo Parametric Ideas 

The best option I am aware of to deal with this is to use a text editor (MS Word) to create all standard notes for reuse. These files can be imported to Creo drawings as notes. There are some formatting quirks that you will have to deal with but once you learn how they behave it is a non-issue. This also ensures that your standard notes can be derived from controlled documents if you choose.

See the note from file details here:

https://support.ptc.com/help/creo/creo_pma/usascii/index.html#page/detail%2Fdrawing_note_insert.html%23wwconnect_header 

I have a list of common notes in a .txt file I use (mostly for consistency and reduces typos)

This post https://community.ptc.com/t5/3D-Part-Assembly-Design/Tips-for-text/m-p/63374 has a TON of tips for formatting text in Creo drawings.

This has been mentioned to the product managers at previous PTC/User meetings so I think it is on their minds. No idea if and when it might be implemented.

We have a mapkey that calls an excel file that then walks the user through picking standardized notes. The excel file then dumps to a text file which is then imported into Creo.