Can we avoid this two level callback hell?

gistfile1.txt

exports.getQuestionDetails = (event, context, callback) => {
  var keys = event.pathParameters.questionId.split("-");
  console.log("keys: ", keys);
  var result = {};

  // Let first query the question table and retrive the question
  let params = {
    TableName: tableName,
    Key: {
      category: keys[0],
      ts: keys[1]
    }
  };

  let dbGet = (params, result) => {
    return dynamo.get(params).promise()
  };

  dbGet(params, result).then((data) => {
    if (!data.Item) {
      callback(null, createResponseWithHeader(404, "ITEM NOT FOUND"));
      return;
    }
    result.question = JSON.parse(JSON.stringify(data.Item.question));
    console.log("result.question: ", result.question);
    // callback(null, createResponseWithHeader(200, JSON.stringify(data.Item.question)));
  }).catch((err) => {
    console.log(`GET ITEM FAILED FOR doc = ${params.Key.id}, WITH ERROR: ${err}`);
    callback(null, createResponseWithHeader(500, err));
  });

  // Let then query the answer table and retrive the list of answers (or empty)
  params = {
      TableName : answerTableName,
      KeyConditionExpression: "#yr = :yyyy",
      ExpressionAttributeNames:{
          "#yr": "qid"
      },
      ExpressionAttributeValues: {
          ":yyyy":event.pathParameters.questionId
      }
  };
  let dbQuery = (params, result) => {
    // return dynamo.get(params).promise()
    return dynamo.query(params).promise()
  };

  dbQuery(params, result).then((data) => {
    // console.log(data);
    if (!data.Items) {
      // callback(null, createResponseWithHeader(404, "ITEM NOT FOUND"));
      return;
    }
    result = JSON.parse(JSON.stringify(data.Items));
    console.log("result: ", result);
    // callback(null, createResponseWithHeader(200, JSON.stringify(data.Items)));
  }).catch((err) => {
    console.log(`GET ITEM FAILED FOR doc, WITH ERROR: ${err}`);
    callback(null, createResponseWithHeader(500, err));
  });
  console.log("result: ", result);

  callback(null, createResponseWithHeader(200, JSON.stringify(result)));

};

The intent was this:

1. first query table "question" (see code from line 6), and if there exist result (i.e., there exist a record in table "question" corresponding the question id) we do next

2. query table "answers" (see code from line 32)

But because of callback is async (see line 61 and 63), result object is still {} although there are record from step 1 and step 2