Hi, unfortunately not as the API used (IEX Cloud) doesn't provide them. The alternative is to display the ETFs that match those indices.
Please see their official answer: https://intercom.help/iexcloud/en/articles/2960833-how-do-i-get-data-on-the-s-p-500-dow-jones-industrial-average-or-other-major-stock-indices

Indeed, sorry, it's because I hadn't setup the add-on correctly in v0.1. I have added a note about that in the changelog but it's not displayed on AMO, I don't know why.
Anyway, I made sure it won't happen again in a future update.
Sorry for the trouble, hope you'll continue to use it! :)