Need high quality images when generate pdf from a docx

[NimeshAppspotr]

    const params = new DocumentMergeParams({
      jsonDataForMerge: JSON.parse(jsonString),
      outputFormat: OutputFormat.PDF,
    });

   need some parameter make the better quality like this =>
       imageQuality: "high", // Adjust the image quality
      compression: "none", // avoid the compression

or else Can you suggest me better way to proceed?