These memory IDs can be accessed in the debugger, but the option isn't accessible by default in the "new" Debugger. To display them you have two options:
In the new Debugger, change one of the tools you're using. Do this by clicking the "New Tool" or "Replace Tool" that you can see at the top of the vertical button column on the right of each subwindow. Open the Special Tools folder in the tree and select "System Areas (Internal Only)". In the second tab of this tool you can now see a list of areas. Double-click the MEMORIES("EXPORT/IMPORT memories") area or manually enter it in the Area input field to open the list of active memory IDs. Click through on any one to see its hexadecimal value.