There are currently no plans for adding Syphon or Spout support in Lightform Creator. This is because the Lightform Creator workflow involves "publishing" video files to a Lightform device, and using an input video stream (e.g. from After Effects) would be impossible to time properly. The suggested approach is to render out a video and bring this video into Lightform Creator.
As of Lightform Creator v1.10, you can alternatively use NDI to stream content out of Creator, and if you have an LFC, you can stream content via NDI to your LFC. More information here.