How to send custom token with MetaMask API?

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I want to select a custom token from the metamasks when clicking, and offer to transfer the custom token, not the ether, the custom token has already been added via

method: ‘wallet_watchAsset’

How to do it? Thx!

sendEthButton.addEventListener('click', () => {
    ethereum
      .request({
        method: 'eth_sendTransaction',
        params: [{
          from: ethereum.selectedAddress,
          to: receiverAddress,
          value: '0x29a2241af62c0000',
          gasPrice: '0x09184e72a000',
          gas: '0x2710',
          data: '', // I understand that something needs to be added here, but what?
        }],
      })
      .then((txHash) => console.log(txHash))
      .catch((error) => console.error);
  });