Can you support EIP712

Hello
We want to build a token on the xdai network
Smart contract pays gas fees through relay
defender openzeppelin
The problem is that the wallet is asking to pay the gas fee xdai
The contract pays the gas fee on behalf of the user.
the other part
The smart contract deducts a fee from our token, to offset network and operating fees
And I can't make the app show the fixed amount being deducted from our token.