Hi,
It seems there is no other way to add the Acronym in Microsoft Search.
The feature Acronym answers in Admin Center should be useful enough for daily business.
Manage Acronyms answers in Microsoft Search
https://learn.microsoft.com/en-us/microsoftsearch/manage-acronyms
Introducing acronym answers in Microsoft Search
https://techcommunity.microsoft.com/t5/microsoft-search-blog/introducing-acronym-answers-in-microsoft-search/ba-p/1122809
If you still want any other way such as PowerShell, please post your feedback in Windows Feedback Hub.
- enter Win+F to open the feedback up
- Summarize your requirement
Thanks,
Eleven