Charon has plugin in Unity Asset Store.
Step By Step
Install the required software for your operating system (see Requirements).
Make sure your Unity version is 2020.1+.
Open the Charon plugin in Unity Asset Store .
Add To My Assets.
Open Unity Package Manager by going to
Window → PackageManager.
Wait for the package manager to populate the list.
My Assetsfrom the dropdown on the top left corner.
Charonfrom the list and click download. If it’s already downloaded, you will see an import option.