Add Progression to the Progression Link

[maxpiva]

Hello gents,

I have a question about the newer OPDS progression schema.

Is the progression property inside the progression link currently supported, or is there any plan to support something like this?

<link
  rel="http://opds-spec.org/progression"
  type="application/opds-progression+json"
  href="/{opdsPath}/progression/{seriesId}/{chapter}">
  <properties>
    <progression progression="0.5000" modified="2026-06-11T12:30:00Z">
      <device id="123" name="123"/>
      <references/>
    </progression>
  </properties>
</link>

The schema example shows that an authorization object can be included inside the link properties. Would it also be valid, or is there any plan, to include the progression object itself there?

The rationale is that a client browsing many books or chapters currently needs to call each progression endpoint individually to retrieve the current read state. Including the progression data directly in the feed would avoid those extra calls and make large libraries much more efficient.