createOptionForm without relationship

I am stuck in this scenario,
I have source model that has possible sources, when user is registering the user can select the existing source or create a new one.
But as far as I know to use createOptionForm you need to bind it to the relationship. And the problem is since there is no user instance to call relationship on, it's not working. Is there any way to use createOptionForm for Model and not relationship ?
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