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Send text from Bubble DB as base64 encoded via API Connector

I want to use the GitHub API to create a new file in a repository.
For that I want to send some text I saved in my Bubble DB as base64-encoded through the Bubble API Connector to the GitHub API. But it seems that when I create a workflow and try to use the text from the Bubble DB, there is no option to base64-encode it. There is only the JSON-safe option (which is not base64-encoded as fas as I know). Do I miss something?

Thanks!