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Enumerated custom field in Lock possible?


I’m reading this documentation to learn how to customize sign up fields in Lock, and I understand now how to add basic text fields to my sign up form. But 2 of the fields I need to add are actually dropdown lists to let the user choose a value from a set of given possibilities, and I couldn’t find any way to do that, either in the documentation or in the source code for Lock (on iOS).
Is there an undocumented way to do that? Or does that requirement alone force me to have a completely custom UI for my authentication interface?