Yes, Answering just means the bot will always reply.
The easiest way to load JSON data without hosting on botlibre.com would be to write a Self script that imports the data. Self can import any JSON or XML data from a URL.
For example you would make a Self script that responds to the pattern "load my data" and calls a function that loads your JSON data from a URL.
Here are some examples data script, you can add your JSON data to our script library to get a public URL for it (or use your own website, or any other web service)