Possibility to add additional data to contract's calldata

[happyeric77]

The project I am working on requires appending additional data to the smart contract calldata field.
However, it seems like Metamask puts a validation to check the calldata format. I am not sure how it exactly works.
I assume metamask looks for the corresponding abi for those validated contract. And use it to validate the calldata.
I am wondering if we can somehow get around it.
For more detail, here is the discussion in StackOverflow

[SyedAsadKazmi]

Yeah, I think it would be great if instead of just invalidating any extra data passed to the token transaction like approve, transfer, etc., the attached extra data should be shown to the user in the actual as well as decoded format, so as to retain the transparency of the transaction.