I would like to create a plugin to handle ETN, and was wondering what the proper configuration was. Since all wallet and deposit/withdrawal operations go through the bitHolla servers i am unsure what will be supported in future updates, and creating a plugin which injects the desired behavior into the toolkit seems unwise.
The best way is for it to be supported by the vault natively. Similar to fiat asset plugins assuming you have the mint/burn function for this specific asset, you can technically make a plugin to support that but its going to be a bit challenging.
The process would be similar to the bank integration and you can read the docs for it here: Bank integration - HollaEx with few considerations to keep in mind.