Is it possible to make animated blockbench entity models in version 2021.3 (1.17.1)?

I looked for it and only found animation videos in one of the snapshots of 2020 and from 2023.1 (Geckolib is only in those versions), but I want custom animation for my entity in version 2021.3. I looked in Blockbench, under "modded java entity" there is something called "animate" in the upper right corner, but it is not compatible to be added in 2021.3, can someone help and is it possible to animate in version 2021.3? (By Google Translate)