targetRoas property

The target ROAS (return-on-ad-spend) for this ad group.

This field lets you override the target ROAS specified in the campaign's bidding strategy, but only if the campaign is using a standard (not portfolio) TargetRoas strategy or a standard MaximizeConversionValue strategy with its target_roas field set. If the campaign is using a portfolio bidding strategy, this field cannot be set and attempting to do so will result in an error. For any other bidding strategies, this value is ignored. To see the actual target ROAS being used by the ad group, considering potential overrides, query the effective_target_roas and effective_target_roas_source fields.