Hi Vlada,
Indeed, you'll have to create a new field. What I did to tackle this, I created a set of custom '
generic fields' in marketo (some text and checkbox fields) to use at random in such situations.
You can insert these in a form, for example: 'Generic 1' is a text field, which you insert and change the name (in this case: 'other').
Some caution is required when using this method:
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Generic fields are reusable for series of forms and capture data you don't want to save or use (kinda one-off data) in Marketo (ex. answers to why did you like our white paper?)
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when you use a generic field - send an alert with this data to an inbox (alert email with token is enough) as you are probably using this field in multiple forms
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you can't use form pre-fill when using a generic field (you don't know what might pop up since you use this field in several forms)
This method of course has the advantage that you only need to create a couple of these fields and hence not clutter your marketo database with random fields you only used once.
Hope this method answers your question.