It must be in English.

Not necessarily, but having an English trademark will give you more advantages. And if you want to apply for a specialty store or an official store, the trademark must be in English.

Sellers with Chinese trademarks can still publish products, but in the product attributes - "brand name", because Chinese characters cannot be displayed, the Chinese trademark cannot be displayed, while the English text trademark will be displayed normally, which can give you more exposure opportunities. At the same time, English trademarks are also easier for buyers to recognize brands and shop, laying the foundation for creating international brands, so it is recommended that sellers register English trademarks at the same time, which is more advantageous.