how to share a synced yahoo calendar

Hey all,

I synced my yahoo account with my iPhone (adding the account, adding the calendar), and then calendar shows up under Yahoo! in my list of calendars in the Calendar app. However, when I tap the calendar name, there is no "Share Link" option. The source Yahoo calendar is public, and my goal is to be able to share this Calendar as a link (an .ics url) (similar to how I would be able to choose an iCloud calendar and select "Share Link").

In the past, somehow I was able to duplicate this Yahoo Calendar to an iCloud calendar, and it showed up as My_Yahoo_Calendar (if the source name was My Yahoo Calendar). Then, from this newly created iCloud/Yahoo calendar hybrid, I had the option to "Share Link".

However, I have no idea how this calendar was created and I can't seem to replicate this action. Would love some help!