This page explains which 3rd-party plugins are known to be compatible and which are known to not be compatible with Export2Canvas.
A list of 3rd-party plugins known to be compatible with E2C. Keep in mind, this list is not exhaustive and it is likely that there are many other 3rd-party plugins which are compatible, but it has not been confirmed by us.
Notice: We recommend using the built-in JsonUtility instead of any 3rd-party JSON plugin. Read more here.
And here is a list of plugins which we get frequent questions about, but are known to NOT be supported. Again, this list is not exhaustive.
We are constantly improving Export2Canvas and making sure we support a wider range of Unity features and 3rd-party plugins, so this list may change and some plugins may move from the not compatible section to the compatible, but there are no certain dates for that as of now.