I know the question is a couple of years old, but I am stuck at the exact same use case. I am also trying to access the information which is located under the "Docker Info" tab in a key/value pair in the Artifactory UI. I tried the approach in the accepted answer, which does return the properties object. But for me there is no .label part included. Basically I think this is because the information I want to request is not in the manifest.json. It is located a level "higher".

To help visualize this, I have the following screenshot:

Here you can see on the left my Artifactory with the selected Docker image. I want to request the information from the key "release". On the right side I opened the browser developer tools to check the request that gets executed when loading the Artifactory page. Under Network in the tab "Fetch/XHR" you can find an entry "dockerv2". When selecting this you can see under "Response" a "tagInfo" object which contains the desired information. So I guess it should be possible to request that information via an API call.

I tried the following:

curl -uadmin:pass https://artifactory.myUrl.io/ui/api/v1/ui/views/dockerv2/repo-name/path-to-image

But this returns 404 not found. In my opinion the URL is not right (because contains ui parts), but the developer tools shows this as the Request URL.
So I am kinda stuck on how to figure out the correct request. I would say it is possible to retrieve the desired information, because it is available and it should be accessible. Anyone has an idea on how to approach this? Thanks in advance!

If more information is needed, please let me know.