REST API: Can I mark a custom field type of email as Marketable?

I have a custom field in my contacts that is an email type. Using the REST API, can I mark it as “marketable” (i.e. opt-in)?

I have successfully used the “opt_in_reason” on the main contact emails. However I have not found a way to do this for custom email fields.

Thanks in advance for any information,

In order for optin to work the email must already have been stored on the email table. A custom field does not accomplish this. If the email had been added at one time through a normal email on a contact record then it would succeed even if the contact had already been deleted. But if it’s a new email, then the system has no record to opt in

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Thank you for the reply & Info.