Current behavior: 

Context key is shown in the Context note tab. If the user needs to see the context information, they have to switch between Context note and In-context preview. 

Requested behavior:

Context key information is available in the CAT Pane as a part of segment information.

Use case: 

Some teams require to check not only previous and next segment info, but also context key (Segment Key). Having all information at one place would allow for a quicker assessment of the segment and speed up the translation.