A family of Microsoft word processing software products for creating web, email, and print documents.
This is a user-to-user forum, so nobody here will be able to reply on behalf of Microsoft.
You can post a suggestion to add more dictation languages for future versions by posting in the Uservoice forum at https://word.uservoice.com.
Rather few languages are supported fully: Chinese, English, French, German, Italian and Spanish (see https://support.microsoft.com/en-us/office/dictate-your-documents-in-word-3876e05f-3fcc-418f-b8ab-db7ce0d11d3c). Some additional languages are "preview" dictation languages in Word.