Double chest and animation

Sorry my english, using google translate.

Hello! How are they? I am new to this and I have two questions:

1) How can I make one block interact with another block and together form a new double block? In the best style minecraft chests. I want to do something similar to the chests.

2) IS there an animation program like MCAnimator? Simple. Im using BlockBench but the animation is only for Bedrock Edition. Can I use that animation for Java Edition?

:)