How to process image tag without creating JSOUP Document

I am having an Image tag as String. I need to parse the tag and add class and height and width for the tag. For this, I have used the below JSOUP code.

String imgTag = "<img class=\"fit-picture\" src=\"/Downloads/grapefruit-slice-332-332.jpg\" alt=\"Grapefruit slice atop a pile of other slices\">";
Document doc = Jsoup.parse(imgTag);
Elements img = doc.select("img");
for (Element image:img) {
image.addClass("abc");
String styleStr = image.attr("style");
                    boolean setSize = true;
                    if(styleStr != null && !styleStr.isEmpty() && (styleStr.contains("width") || styleStr.contains("height"))){
                        setSize = false;
                    }
                    if(setSize) {
                    String w = image.attr("width");
                    String h = image.attr("height");

                    if(w == null || w.isEmpty()) {
                        image.attr("width",width+"");
                    }
                    if(h == null || h.isEmpty() ) {
                        image.attr("height",height+"");
                    }
                    }
}
String imgrep = doc.body().html();

Output:

<img class="fit-picture abc" src="/Downloads/grapefruit-slice-332-332.jpg" alt="Grapefruit slice atop a pile of other slices" width="332" height="332">

In the above code, is it possible to achieve output without creating a JSOUP document? Like standalone Tag or Element object to achieve the same

Thanks in advance.