Here are a couple of companies mentioned in this article (https://www.forbes.com/sites/zinnialee/2021/06/23/bitcoin-mining-companies-exiting-china-as-authorities-crackdown-on-cryptocurrencies/):

• BIT Mining: https://ir.btc.com/
• Canaan: https://canaan.io/

Basically, I think this is just going to be a manual research task -- search for articles on BTC mining companies in China, and you can be confident they're looking to relocate.