How to add multiple custom fields in a Subscriber List

Hello all,

according to my understanding in order for custom fields to be able to saved in each subscriber, the corresponding custom fields must exist on the corresponding Subscribers List.

So this bring me to my question. Is there any way to Create a new Subscribers List and add all needed custom fields at the same time (the way import many subscribers work -  where all custom fields are passed in the body payload of the method) ?

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