You can see the time a value was set for a property (in this case, the HubSpot Owner property) in the property history. There’s an example of this (see the versions array) in the Get a Contact by ID endpoint doc:
GET /contacts/v1/contact/vid/:vid/profile - For a given portal, return information about a single contact by its ID. The contact's unique ID's is stored in a field called 'vid' which stands for 'visitor ID'.
I’m not entirely sure what you mean by feedback note. Are you looking to get the most recent associated NOTE engagement? In that case, you can use the engagements API:
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