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One way to associate the type of a key within an object to that object is by creating a separate object or map that maps each key to its respective type. For example:

const myObject = {
  name: "John",
  age: 30,
  location: "New York"
};

const keyTypes = {
  name: "string",
  age: "number",
  location: "string"
};

In this example, the myObject contains keys name, age, and location, each with a respective value. The keyTypes object maps each key to its respective data type (string or number). By doing so, we can easily reference the data type of each key within the myObject object.