A potential solution to your request would need to solve three main issues:
1. Accessing an external CSV file.
2. Parsing the contents of the file.
I will comment on each of the above in the reverse order.
1. Opening an external CSV file from a HTML page being viewed in a web-browser.
notes on point 1:
a. This is the main reason why I asked (in your previous question about this subject) if you were planning on hosting the released version of your story HTML file on a web-server, because it's easier to retrieve CSV data from a web-server that it is from a local file.