Excited to have ya on board! As an artist and writer (and human) it's important to me we keep the integrity of the icon to a high and reliable standard. Don't want folks getting confused if we can avoid it.
I'd say if there's any doubt in the art you're using (stock art is totally fine) is made from ai art generators, I'd ask you not use the symbol (even if the writing is human made).
I'm not familiar with Canva enough to give you a direct answer. I'd just ask if we can keep the use of the icon as an 'all was human made' on projects, that'd my preference to avoid confusion and ill feelings from the folks looking for great human made experiences.