Is better reminders integration with the URL field anything that’s being explored for a future version?
If the callback-url is moved from notes field to the URL field, direct linking from the reminders app on iOS is much easier.
Unfortunately this is not in our hands and a limitation+bugs on Apple’s end. You can read all the details here: URL of note put in wrong reminder field
As a workaround a fellow Agenda user made this shortcut: Move URL from notes field to URL field in Reminder app