Feature Request: Calendar Appointment Request

I'd really like to see the ability to share a link for one of my calendars that allows a user to schedule/request a block on my calendar (which I can then accept or not) based on entire availability or pre-defined appointment slots, similar to Koalendar or Calendly. Google/Microsoft calendar users shouldn't be the only ones to get integrations like these; Proton Calendar is an excellent service and should be included in such lists!

Is something like this already on the roadmap or being discussed?