Apple Pencil + iPad + Google Docs

I'm following up with the post:

https://discussions.apple.com/thread/8164322

In this post, PaulFromNB claimed that he could do Insert -> Drawing and and use Apple Pencil to draw in it. However, I cannot find "Drawings" in Insert entry (menu that appears when tap on "+"). I also checked all other menu entries and unable to find this Insert -> Drawings entry.

So where is this Insert -> Drawing function in the Google Docs?