如何逐行构建JSON数组（遍历列表）。 FlexJSON

I'm using FlexJSON(but I'm open to other libraries) and I want to manually build a json array. I have certain things that I need to add that are not part of the model that is being serialized. For instance I want to add an html column and css column to my json array. This data would be determined by iterating through the list and seeing if the values are above or below a certain number.I'm using FlexJSON(but I'm open to other librar