Hi @jgravenslund,
Thanks so much for using our plugins and for reaching out to us!
We have looked into adding these fields, however, the API from Mailchimp does not allow implementation of adding a phone number. You can check out the API call used for the “Subscribe Member” action by clicking here. It is called “Add member to list.”
Could you please clarify what you mean by “sliderinput” so we can provide you with more accurate information?
Best regards 