How to make animation like shulker box?

what you could do is to use the Model just like the Optifine CEM Feature.

You can use Entity Model JSON to replace vanilla Models.

Here is a quick Tutorial:

1. First download the Plugin you need for Blockbench. Check this link.
2. Then import the js file in Blockbench as Plugin
3. Convert your Model Project to Entity Model JSON Format.
4. After that create the following folder structure inside your Mcreator Project Folder(Open Workspace Folder): <workspace-folder>\src\main\resources\assets\minecraft\textures\entity\shulker\<place model and texture file>
5. Then you need to download the API for Entity Model JSON that I also created and will be released today as Plugin for MCreator.

And here is another important note:

Pls change the Model File name to the entity texture file.