It would be helpful to be able to add specific add on features (such as the LinkedIn Sales Extension) to the Hubspot/Outlook Sales Add In feature.
Use case:
A teammate is using templates to email a prospect and see on the LinkedIn sales extension that they recently changed jobs. They easily update their job title and employer. The information provided by the add-on provides them with different context to add to their email.
Another example:
A client and employee are emailing back and forth about a pricing issue and the teammate can see that they just signed their contract using the Docusign add on.