Use Captcha as form field

Hello there,
I would like to ask for a feature: I think it would be awesome, if the captcha could be used as a required form field, instead of using it only on submit buttons.
Here is my use case: I have a form with six different submit buttons and the captcha is now acitve on all six of them. If I could do the captcha only once as a field, this would be awesome.
Thank you in advance!

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