Linking scene's first back button to last layer of a previous scene.

My new project has 4-parts (or have 4-parts. English not my original tongue :-).
I created each part on its own scene.

I now want to assign the first "back" button on each scene to jump to the last layer on the previous. However, I'm  not seeing how to do this.

In the trigger dropdown option, I only see base layers to assign to and not any individual layers within a particular scene.

Is this possible?

Thank you in advance for any assistance.

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