DOORS Next Change Set REST API needed

Need to report on the history of the requirements.
The DOORS Next API allows to see all the details with the history=true parameter.

The issue is that this history can grow exponentially and be very time consuming to parse.
Also we want to filter based on some change set, or base on when those CS were delivered (not created).

It would be more efficient for the user/report to start with a list of Change Set (CS) and have the history from those CS.

Using a REST Client we can have some information about the CS (I assume that is not a public API)
i.e. https://<server>/rm/cm/changeset/<UUID>

Like
    <dcterms:created
    <dcterms:title
    <dcterms:creator

But more is required, such as the history changeLog render by history=true

<history:changeLog>
        <rrm:creator>
        <rrm:modified>
        <history:changeOrigin history:changeEvent="ARTIFACT">
            <rrm:about>
            <rrm:title>
        </history:changeOrigin>
        <history:changeEntry history:changeEvent="ATTRIBUTE" history:eventType="ADDED">
            <rrm:title>Primary Text</rrm:title>
            <history:value type="url">
        </history:changeEntry>
        <history:changeEntry history:changeEvent="ATTRIBUTE" history:eventType="MODIFIED">
            <rrm:title>Title</rrm:title>
            <history:value type="string">
        </history:changeEntry>
</history:changeLog>

A CS can be created in a Stream and deliver to another Stream.
Currently there seem to be no way (including the UI) to know when the CS was deliver to the Stream.

Currently we know when the CS was created, but not delivered.
Therefore a history of the CS is necessary
      Created By
      Created On
      Created In  (Context Stream)
     
      Delivery History (0..*)
              Deliver Against (Steam
              Deliver When