As title says, would it be possible to make it with any format? Java, json or anything ?
it would be really nice to have it.

oh okie thank you didnt knew about it !

https://github.com/tom5454/CustomPlayerModels/tree/master/Blockbench
There is a blockbench plugin, it has a few bugs, but it works for the most part. You can export cpmprojects with the plugin from Blockbench.