List of available metrics that Klaviyo provides through an API available here.
We highly recommend to contact integration platforms to figure out what metrics they can extract. Sometimes integration platforms don't have certain metrics out of the box, so it's better to contact them.
More integrations to Google Data Studio
Google DataStudio is a powerful tool for making data visual. But you should not have to upload your data by yourself. Connect other sources of data to automate the process.