How do u get the "fallback" market web presence when primary market is deprecated?

Hi, I’m still confused by the new markets api update and need your help.

The concept of “primary market” now has become “backup region”, but I can’t find any query to get the “fallback” market web presence associated to the backup region.

FYI, many users of our app weren’t even aware that they need to assign languages to a market. So we let app to pick the “default” market and assign languages for users. This was easily done with primary market.