The .js extension is a JavaScript file. Normally that file would run in an HTML page and generate some more HTML to embed in the page (JavaScript files are programs and they could do a lot of things; I think this one probably is designed to create a table on the page.)
JMP has no way to run the .js file to get the answer from it.
JMP expects the table to be embedded in the source when it opens the HTML.
Not sure you can go much further than this.
Craige