How metamask detected included token?

For a new token to be automatically acquired by the metamask we have the following code:

   const tokenAddress = 'CONTRACT_ADDRESS';
    const tokenSymbol = 'SYMBOL';
    const tokenDecimals = DECIMALS;
    const tokenImage = 'URL_ICON';

try {
  // wasAdded is a boolean. Like any RPC method, an error may be thrown.
  const wasAdded = await window.ethereum.request({
    method: 'wallet_watchAsset',
    params: {
      type: 'ERC20', // Initially only supports ERC20, but eventually more!
      options: {
        address: tokenAddress, // The address that the token is at.
        symbol: tokenSymbol, // A ticker symbol or shorthand, up to 5 chars.
        decimals: tokenDecimals, // The number of decimals in the token
        image: tokenImage, // A string url of the token logo

  if (wasAdded) {
    console.log('Thanks for your interest!');
  } else {
    console.log('Your loss!');

Now, there is a discomfort. Each time tokens are purchased, this code is activated, regardless of whether it has already been included.

My cuestion is…

Is there a way to detect if metamask already has the token included?