Pixels are not officially sold by Google in Thailand, so repair technicians are generally not familiar with them. Your best bet is to visit repair shops until you find one willing to give it a shot based on online instructions or videos. They (or you) will likely need to order in a replacement battery from China. They will likely be reluctant to offer any guarantees. I was unable to find any shop willing to replace a battery in a Pixel 3 XL several years ago and ended up doing it myself.