At this point, it feels like literally anyone could appear anywhere, so why not him?
Miles Morales and Kamala Khan are in fact no strangers to each other: in the comics, the two would often hang out, both suited up and in casual, non-supehero settings.
This is why some fans took to Reddit, suggesting that Morales might as well be introduced into the MCU in 'Ms. Marvel', even though Sony's animated movie about him hinted at the fact that he does not in fact live in Earth 616.
This fact is something that prevents some people from thinking that Miles can make it into the MCU.
Plus, there are always potential copyright issues.
However, a certain deleted scene from 'Spider-Man: Homecoming' has also indicated that there is someone named Miles in 616, and this person is connected to Donald Glover's character from the movie.
In 'Miles Morales: Spider-Man', the two are seen teamed up a couple of times. Particularly, Miles once saved Kamala from Knull by using his Mega Venom Blast, and the two also had to deal with King in Black.
However, neither of the released posters, trailers or other promo materials for 'Ms. Marvel' have hinted at the possibility of Miles Morales joining her on screens after the series premiere on June 8.
Miles, in his turn, is due to hit big screens with Sony's 'Spider-Verse' sequels that are currently scheduled for 2023 and 2024.