There is a good 99% Invisible episode about adding "Person in the lotus position" and "person with headscarf" if you'd like to know more about the process. The reporter only wanted to document the process but ended up submitting a proposal to the Unicode consortium for "Person in the Lotus Position."

https://99percentinvisible.org/episode/person-lotus-position...

On a related note here is a proposal for a recent update to the animal emoji set. It's interesting to see the factors they consider when choosing whether or not to integrate a new emoji. I didn't know that much thought went into what they chose.