JSFiddle - React, Tailwind, and code Playground

JavaScript

var groupArrays = {
    "group1": [
        "volvo",
        "bmw",
        "audi"],
        "group2": [
        "red","green"],
        "group3": [
        "1991","1992"]
};

var selectors = [];
var selector;

for (var g1 = 0; g1 < groupArrays.group1.length; g1++) {
    for (var g2 = 0; g2 < groupArrays.group2.length; g2++) {
        for (var g3 = 0; g3 < groupArrays.group3.length; g3++) {
            selector = "." + groupArrays.group1[g1] + "." + groupArrays.group2[g2] + "." + groupArrays.group3[g3];
            selectors.push(selector);
        }
    }
}

console.log(selectors);