Return value from callback

I have value inside callback function and couldn’t return successfully.

async pos(convertedCodeDBSearch) {
    var dd;
    const x =  await idealPostcodes.lookupAddress(convertedCodeDBSearch, function (error, searchResults)  {
      return searchResults.result.hits[1];
    });
    console.log('x', x);
  }

I need to return searchResults.result.hits[1]; from function.
Here is the code,
Thank you.