get droplink rendering parameter value in xm cloud

You have to set the following configuration to true to get the detailed information on rendering parameters set.

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>
      <setting name="LayoutService.DetailedRenderingParams" value="false">
        <patch:attribute name="value">true</patch:attribute>
    </setting>
   </settings>
 </sitecore>
</configuration>

By default this setting comes as false.