How to specify the ad groups display language via the Search Ads API

In Apple Ads UI -> Ad Group -> Ads -> Default Ad, there is an Ad Language dropdown.

In Campaign Management API v5, I can’t find any equivalent field on Ad Group create/read/update to set or retrieve that value.

I would like to know:

  1. whether this ad language setting is exposed via API at all, and
  2. if yes, which endpoint/object/field maps to that UI control?

https://developer.apple.com/documentation/apple_ads/get-all-ads

How to specify the ad groups display language via the Search Ads API
 
 
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