EIP1559 on signTransaction() transaction object vs sendTransaction() transaction object

[lazymori]

web3.eth.sendTransaction() allows transaction objects to have some of these new fields according to EIP-1559 standards.
However, this way requires user to sign the transaction at the web application.

I am currently using web3.eth.accounts.signTransaction() so that time will not be wasted signing on the web application, but the transaction objects seems to not accept certain EIP-1559 standards fields like maxFeePerGas and maxPriorityFeePerGas. In fact, this transaction object still requires gas which is gas limits.

May I know if this is the intended design, or if there were constraints, or how can I allow my users to indicate maxFeePerGas and maxPriorityFeePerGas on a transaction object for web3.eth.accounts.signTransaction()