Is there a field to link a contact to task?

As the subject asks, is there a field, or discussion of a field, to include in tasks linking a contact to a task?

The use case is simple. For example:

Task: Call Mike

Then when the task comes up, a link exists to Mike’s contact info, and I have immediate access to his phone number.

As people continue to shift towards mobile devices, it seems this would be even more useful.

I understand that the CalDAV standard doesn’t include this, so this would have to be an app-by-app feature.