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Yes, that is correct, the only option would be to copy the CSS code manually from the Preferences window (as shown here: Inject Custom CSS Codes).
Could you please tell us why you would like to have the button so that we can give more details to our UI team about this possible feature?
I ask since usually you are adding CSS code to your form and not taking it out from it, so a much greater number of times, you would need the button to paste the CSS code from clipboard, more than the one to capture it.