How to get DataTypes from imported package

I was trying to create a custom action using https://github.com/jgithaiga/flutter_sms_inbox package.
I want to read SMS messages on the device and return them as a list.

flutter_sms_inbox has a SmsMessageclass that I want to use as a return type.
But I can't, because flutterFlow does not have it among it default data types, or under Data Types.

How can I fix this?
Should I create some new MySmsMessage class and do the mapping before returning it from the action, to make it work?

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