Asp.net - .net Ashx Web Handler How To Return Lists?

I have a vb.net web handler which builds two strings The strings basically looks like this:

["filename", "filepath"],["filename", filepath"],...,["filename", filepath"]

I need to return it in a way that the strings are sent with the name of the list, followed by the list

["listname": {["filename", "filepath"],["filename", filepath"],...,["filename", filepath"]}

I know that the web handler will automatically json encode the data, and that the way I have built my list should be reworked (the way we previously used this it was exactly what we needed).What might be a better way for me to house my data and return it to the browser in a way that is understood correctly?