Allow Customized Attribute Mapping from Identity Provider

It would be incredibly valuable if we were able to add additional attributes to user objects synched from identity providers/external domains. For example:

In Azure there will be an attribute that represents the user's manager. In various Jira products it would be very valuable to have access to this attribute because it would enable us to automatically populate an approval workflow with their management structure. 

Many attributes in an organizations domain/idp may be very powerful/useful in any number of Atlassian products, and while add-ons exist to allow extended attributes the pricing structure is pretty exorbitant.

As we can already provision user attributes from our synched domains, please allow us to create additional target attributes within Atlassian that can be provisioned.