Please provide query string for a Google Sheet containing the values for the Silver Squares you want to use. The Google Sheet must be published so that anyone can read it.

An example of the format of this sheet can be found here: - https://docs.google.com/spreadsheets/d/e/2PACX-1vRAgns0L6jZsywPxFmwRiz9JlCy_6r5LONabkL5aksu7xaT4jpjYahlv9cYgBOyvOoZK1TcLiIWJQ91/pubhtml

Once you have published the document, you can paste the URL for your sheet (the one you use when editing it) as a query string to this URL. Example URL with query string parameter: https://silversquares.o.matic.app?https://docs.google.com/spreadsheets/d/1PpxNYo6LvnKhgJJlRwooBr93gOLCekHi0R-dwhQHwJY