Of course, there are a few references to Enoch and the Nephilim in the canonical Bible.

And citing the Ethiopian Tewahedo is a good reminder to us all of the importance of the witness of this very ancient church. Not much is available about their texts but see “The Biblical Canon Of The Ethiopian Orthodox Church Today” R. W. Cowley, Ostkirchliche Studien, 1974, Volume 23, pp. 318-323.