"Update Datasource Connection" API doesn't support service name update?

Latest (and previous?) Tableau REST API for Updating datasource connection doesn't seem to support the change of the service name for Oracle connections:

-

- Reference-Tableau Server REST API - Tableau

In the datasource file its located somewhere around here:

<datasource ... >

  <connection class ... >

    <named-connections>

      <named-connection ...>

        <connection authentication='...' class='oracle' ... service='<SERVICE_NAME>' ... />

      </named-connection>

    </named-connections>

...

Is there an API for this or a known workaround other then re-publishing the datasource or making change via UI?

Thanks.

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