Hi Anshuman,
Thank you for reaching out to the Google Ads Scripts Support Team. Please excuse us for only getting back now as your message failed to be routed to our support queue.
Upon checking your concern, I would recommend to make use of a third-party API in order to check for your ads' spelling and grammar mistakes such as the Bing Spell Check API <https://searchengineland.com/spell-check-new-expanded-text-ads-adwords-script-256914> as well as the Rapid API's Grammar Spell Check <https://rapidapi.com/collection/grammar-spellcheck-api>. You can use the UrlFetchApp <https://developers.google.com/apps-script/reference/url-fetch/url-fetch-app> in order to access the APIs to check the words or sentences you'd like to check. Afterwards, you would need to process what the API would return based on it's response with your implementation.
For accessing the entities, kindly check our AdsApp documentation <https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp>. For migrating, please check our migration guide <https://developers.google.com/google-ads/scripts/docs/migration>.
Let us know if you have any further clarifications.
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Google Ads Scripts Team |