Can I apply for a visa extension in Thailand without an embassy letter or a TM 30?

The user inquired about the process of applying for a visa extension at the Chonburi Immigration office in Jomtien, specifically regarding the necessity of a letter from their embassy due to the Covid situation, and the requirement of a TM 30 form for the extension. Commenters clarified that an embassy letter has not been required for over a year, but the TM 30 is still necessary.