Yeah, this is critical for me to adopt Orion as my personal web browser.
(I'm currently using Orion for work, since my work Mac isn't connected to my personal Apple Account or phone anyway, so losing this capability isn't a regression in my workflow.)
I work on Mac software, and auto-filling codes from Messages Just Works™ in text fields in our app once we set the contentType appropriately, but they're native text fields and not web content...