If you have needs to report tax, you can try to use CoinLedger to import and classify.
CoinLedger is a third-party transaction record aggregation platform that allows you to import Pionex's transaction history CSV and calculate them on CoinLedger for tax filing.
CoinLedger official link: https://coinledger.io/
The 3 steps on CoinLedger
1. Register a CoinLedger account
2. Select your country (fiat currency), exchange (Pionex)
3. Upload the transaction record CSV file