JSON schemes for particular data attributes

I am not sure if I am able to explain this but I'll try. If I work with custom schemes, I can write them in JSON and I can set up basically anything in there from font size to colors. However, the schemes are always written for general use. Meaning that I can use the JSON for any report in Power BI. Now, is it possible to actually do the JSON scheme customized for particular data sets? For example, I've got attribute called "Brands" (let's say Nike, Adidas, Reebok, etc.) used in a bar chart and I would like to use particular column color for each brand. Now, of course I can do this in PBI Desktop itself but could I assign the colors to particular brands in JSON too?

Thanks to anyone trying to understand this.