When creating a custom form field, is possible extend from another filelds, ex.: JFormFieldList, JFormFieldText. And when extend of this filelds, is usual to override the getInput() or getOptions() methods.

Now, I'm extending JFormFieldList, and I want to keep the original getInput() but adding a custom attribute to each option of select.

I think that this to work, the ideal would be to add some property to the option, and on the HTML renderer options() function read this attr and add to the generated html

Below, how I want to override getOptions()

    protected function getOptions(){
        $options = parent::getOptions();
        foreach ($options as $option) {
            $option->attr="myattr='valueofmyattr'";
        }
        return $options;
    }