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Unfortunately no, it is not possible to use password fields as this will activate our phishing filter and result in the suspension of the account and could end in a permanent ban of the IP if it is a recurrent situation.
But you can use a simple workaround that consists in adding a text box field and then creating a condition that if that field is equal to a certain code, then show "fields":
This code is visible when inspecting the source code, so it is more advisable in cases of preventing spam, more than in protecting the form.
You can see here more details:
Please let us know if we can assist you further.