With the current situation, you have probably heard some of the phrases:

Let’s go China!

加油中国 jiāyóu zhōngguó Woman Man

Let’s go Wuhan!

加油武汉 jiāyóu wǔhàn Woman Man

And in fact, the way to express support and encouragement for a person or group of people is through words:

加油 jiāyóu Woman Man

Literally “add fuel”, but it can be interpreted as: “Come on!”, “Let’s go!”. Now you know, if you want to cheer up your favorite sport team or cheer for someone just say: 加油!.