Customize settings from custom app - v13

How do I customize Settings from custom app in frappe/erpnext v13? I would like to add a link (as shown in picture below) in “Settings” shortcut links of “Settings” module from a custom app (say nepali_date).

I was able to add settings by creating a new workspace that “Extends Another Page” (ie, Workspace) called “Settings” and added the shortcuts from there.

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How did you achieve Nepali Date functionality ? Could you share your code ?