Can I apply for a 60-day COVID extension while in Thailand on a visa exempt status?

Hi thanks in advance for any help. Myself and my partner arrived in Thailand on a visa exempt from the UK. We already have a 30 day extension until the 14th of January 2022. We would like to stay in Thailand until the end of February. I have a contract starting in the UK at the beginning of march as a key worker. Can we both apply for a 60 day COVID extension here in Chiang Mai? If so what immigration office would that be? Any guidance would be much appreciated.