The webpage card allows you to embed your favorite webpage right into Home Assistant. This custom card Addon Iframe Card provides support for addon ingress.
This card has the same configuration items as the webpage card. When the url is an addon-slug or addon-slug/path/url , will enable support for addon ingress. Otherwise, it is exactly the same as a normal webpage card. You can get the addonSlug from the addon info url.
For example:
type: custom:addon-iframe-card
url: a0d7b954_nodered