Original paper linked here (behind paywall) [0]. The researchers introduced the human FTO gene into plants to increase crop yields.

Would this be cannibalism?

You could use RNA demethylases from other organisms for sure, but it's a really interesting and weird concept, whether people would consider eating a plant expressing human proteins to be taboo.

[0] https://www.nature.com/articles/s41587-021-00982-9