Minor website javascript edit

I have a website with a gallery array of images, www.futurefactories.com/works. As you will see the “works” gallery is divided into two sections the main gallery and then a second section “Jewellery/Wearables”.
I would like to add a section divide giving three sections to the gallery rather than two.
I am looking for someone to edit the javasript .json configuration file to add this extra section following the existing architecture.
This is a small edit. I will need further work but this is a start