Help with a filtration of products

Hi I'm in need of a help. I'm doing a project, where I work with vuejs. It's a filtration that's been done by other coders, and I've taken over on it. There are two files, but what I need help with is I've got 3 different data-values on the same data-filter. That needs to be checked and active on page load. I should be able to uncheck them and check other filters as well. I've got a class name that is being used at the moment when I manually click on filters. That class name should be added automatically on those 3 data-values.

I will explain more in detail and send you the two files if you are Interested in the project.