Chartio supports querying all of the dimensions and metrics available through Google Analytics Core Reporting API. You can view the API documentation here.
If you'd like to use a goal conversion metric, you absolutely can—you'll just need to enable it in your schema editor. Chartio hides some less commonly used columns by default to make your tables easier to navigate.
To enable hidden columns:
1. From the top navigation, choose Settings > Data Sources.
2. Select your Google Analytics data source and switch to the Schema tab.
3. In the Schema Editor, find your column and check the Visible checkbox.
That's it! You're all set.
As always, feel free to shoot us an email if you're having any trouble.