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Unfortunately, this is not possible to solely add to a form.
We've been asked this before and as mentioned in Facebook Pixel Docs is something that you would need to insert in the header in the source code of the webpage you're embedding it on with the form and not the form itself since that is where the tracking data is used.
You could try embedding the full form source and place it within the form header if you have that type of coding experience but, it's not anything we could guarantee as it could cause unexpected issues with the form functionality if done that way.