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Let's see if there is a local toilet that can be repaired, if not, go to the place that sells the toilet and ask, and then ask how to repair it.
Angle valves should be used regardless of hot and cold water, you can consult the merchant when buying, as long as it is not a rubber closed water core, it can be used as a hot water valve.
You try it first, the connector is unscrewed together, and the joint can be replaced after unscrewing, if the joint cannot be screwed, then you can only find a reverse threaded tap that is consistent with the size of the broken angle valve, and screw it into the broken end, which can unscrew the broken end.
This depends on whether your toilet has passed the warranty period, and it is guaranteed within five years, and their after-sales service is still quite powerful.
Of course, it can be repaired, and it is guaranteed within five years, and you see if your warranty period is over, and their after-sales service is still very powerful.
You can repair it, find a local master to repair it, it's very cheap, usually dozens of dollars.