How do I Animate Blocks? (No Geckolib As it Is No Longer Available)

So I am Using Blockbench and Attempting To Animate Blocks With Smooth Animations... I have a java model with animation, a json model with and animation and a obj+mtl with no animation (all animations are in seperate files). When I try to import the json animation it just doesn't and when I imported the java stuff i can't use it on the block. Does anyone know how to fix this, if not I could always use an entity but I would rather use a block.