Composite data transform

Is there any way to configure a composite dataTransform in the HTML5 Viewer application object?  In this case, I am interested in configuring this one: NAD_1927_To_NAD_1983_NADCON + NAD_1983_To_WGS_1984_5 to go between NAD27 and Web Mercator Auxiliary Sphere.  In the GeometryServer syntax, the syntax used by the REST API is as follows:

{"geoTransforms":[{"wkid":108001,"latestWkid":1241,"transformForward":true,"name":"NAD_1927_To_NAD_1983_NADCON"},{"wkid":8494,"latestWkid":1515,"transformForward":true,"name":"NAD_1983_To_WGS_1984_5"}]}

By editing the Desktop.json.js for the HTML5 Viewer, I can get the individual transforms to work between NAD27 and NAD83 and NAD83 and Web Mercator, but I see now way to make a composite work.

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{
  "configuration": {
    "version": "4.14",
    "application": {
      "proxyUri": "proxy.ashx?",
      "allowUnsafeContent": false,
      "deferredModuleLoading": true,
      "offlineStorageSpaceMb": "50",
      "geometryServiceUrl": "https://gisportal.xxxxx.com/hosted/rest/services/Utilities/Geometry/GeometryServer",
      "datumTransforms":[{"transformWkid":108001,"fromWkid":4267,"toWkid":4269},{"transformWkid":8494,"fromWkid":4269,"toWkid":102100}]
    },

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Is it even possible ?