Hi,
Welcome to the Google Ads API forum channel. I hope you're doing great today.
Upon checking, I'm afraid that it's not yet possible to determine if you're using Smart or Expert Mode setup in Google Ads. I'll raise a feature request for this. Kindly note that we're unable to provide a timeline on when it will be supported. You may monitor our blog (https://ads-developers.googleblog.com/search/label/google_ads_api) and release notes (https://developers.google.com/google-ads/api/docs/release-notes) for the latest updated in Google Ads API.
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Google Ads API Team |