External links directly in lovelace sidebar

Hi everybody,

I remember (or at least believe to) that I had previously already done this, but cannot find anything about it online or in my old configuration files…

Is it possible to add external links in the lovelace sidebar, so that external services can be part of Home Assistant? For example, I have a dockerized ESPHome instance; can I somehow make a sidebar link so that it will open this ESPHome URL while keeping the sidebar (iframe?)?

I could just make a card on my dashboard with a link that opens this in a new tab, but I’d like the idea of including other services in the sidebar. Perhaps I’m using the wrong search terms (English is not my native language), but I wasn’t able to find any solution for this online, yet I believe I had achieved this before and that it is possible. Is it? If so, how can I do it?

Thank you in advance for your advice.

You can try it this way:

Not sure if it works with external links.