While there isn't an integration with Sentry out-of-the-box, you should be able to connect Fullstory with your Sentry instance by installing the @sentry/fullstory package from NPM.
To get started with this, you'll want to follow the steps outlined in our Understanding React + Redux Errors With Sentry and Fullstory article.
To learn more about debugging between these two platforms, we recommend our webinar available here.