How to move email subscriber from wordpress to jetpack

I’m afraid Jetpack doesn’t allow you to import subscribers from a third-party service or from your list of registered users on WordPress at the moment.

To make it easy for your existing subscribers to subscribe again using Jetpack Subscriptions, I would suggest the following:

1. Create a new Page on your site, named “Subscribe”
2. Insert the following shortcode in the page content:

   [jetpack_subscription_form]

3. Send a link to that page to all your subscribers, to allow them to subscribe using Jetpack Subscriptions.

I hope this helps.