I just added the hljs-bigfix-relevance package to npm that allows you to use highlight.js to colorize relevance. You can use it like:
var hljs = require('highlight.js');
hljs.registerLanguage('bigfix-relevance', require('hljs-bigfix-relevance'));
function highlightRelevance(relevance) {
return hljs.highlight('bigfix-relevance', relevance).value;
}
If you display relevance on a web page, you can use this to colorize it.