How to decode a Polkadot transaction call using Subxt metadata

[camboimdev]

Hi paritytech team,

I'm trying to decode a Polkadot transaction call using Subxt, but I'm having trouble figuring out how to extract the pallet_name, call_name, and call_data from the method bytes in a transaction. My goal is to instantiate the extrinsic from this JSON and sign it.

Here is the JSON representation of the transaction I'm working with:

{
    "specVersion": "0x000f4df8",
    "transactionVersion": "0x0000001a",
    "address": "14m5oqLEDXMeydyU84E2gMMykKTt78QBQFWNjKhndm1bgCaX",
    "assetId": null,
    "blockHash": "0x60f8faa6b5dd0febb178e42eb644719357ae555b4cbaefdb32204af379f4d586",
    "blockNumber": "0x0158faa6",
    "era": "0x6502",
    "genesisHash": "0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
    "metadataHash": null,
    "method": "0x050300a653ae79665565ba7fc682c385b3c038c2091ab6d6053355b9950a108ac48b0600",
    "mode": 0,
    "nonce": "0x00000000",
    "signedExtensions": [
        "CheckNonZeroSender",
        "CheckSpecVersion",
        "CheckTxVersion",
        "CheckGenesis",
        "CheckMortality",
        "CheckNonce",
        "CheckWeight",
        "ChargeTransactionPayment",
        "PrevalidateAttests",
        "CheckMetadataHash"
    ],
    "tip": "0x00000000000000000000000000000000",
    "version": 4,
    "withSignedTransaction": true
}

I've looked into using subxt::dynamic::tx but I don't have the pallet_name and call_name, and I'm not sure if I have the call_data from the JSON.

Could you provide guidance or an example on how to decode the method field using Subxt metadata to obtain the pallet_name, call_name, and call_data?

Thank you!