I was trying stuffs from Spring'19 release notes in prerelease org and found a new screen flow component to display the image: https://releasenotes.docs.salesforce.com/en-us/spring19/release-notes/rn_forcecom_flow_design_screencmp_address_and_image.htm?edition=&impact=
While checking this in org I got the configurable parameters in the right panel as shown in the image.
But there were some more parameters in the section named as "Store Output Values" (in red box) for the component which I didn't get what they were for. I searched for the documentation as well, but didn't get anything for v45.0 API. Anybody tried this and can explain?