How can I view all items pinned to a program's jump list on Windows 10?

Per this post you can get to them through shell:Recent\AutomaticDestinations and Shell:Recent\CustomDestinations.

The post also has batch files to export and import.

I confirmed this works exporting from Windows 8.1 and importing to Windows 10. Note however that Windows 10 limits the number of pinned items when you could change this in Windows 8.1.