Download blockbench : https://blockbench.net/

In blockbench: file > plugins > Load Plugin from url
put this url:
https://gistcdn.githack.com/fadookie/8db7437479baaf34f76cd19283451050/raw/518fb23569f2d933406fdca3791adb1f0d6792cb/modded_entity_fabric.js

file > new > modded entity > fabric 1.15 (1.15 and 1.16 entity models are the same)