How can I sign a transaction using web3-react library?

[zhaoyi0113]

I am using this library in frontend to interact with smart contract from ethereum network. I need to sign a transaction when calling smart contract methods. But I can't find any method can do the work from this library. I found the web3 has a method: https://web3js.readthedocs.io/en/v1.2.11/web3-eth.html#signtransaction, I wonder if I can get web3 instance from any hooks? Or do I have to create a web3 instance separately?

I appreciate any suggestions and tips on how to make it work.