SharePoint 2019 Column Formatting On Premise doesn't work when you add it on a Page with List Web P

jinthakur 
I'm on premise and need to do colour coding. I'm using your code above as a basis but can't tell which "red" for instance is a style declaration and which is the text in the current field.
I have a choice column called category will values such as "Business", "Project" 
Are you able to tell me how to amend your code sample to check for these text values please?