Ability to email to Success Plan Timeline

Currently the “email to” functionality supports sending an email to Gainsight for attachment to a C360 or R360 timeline.  However, there does not seem to be any way to associate an email with a Success Plan Timeline and since the functionality to move a timeline entry from one timeline to another doesn’t exist either, there is no way to associate an email with a Success Plan timeline.  Please provide a mechanism to do this in the product.