I need help reporting on a custom header please?

Here is my custom header value:

x-emby-authorization:MediaBrowser Client="Emby Mobile", Device="Chrome 54.0.2840.100", DeviceId="d964b3273b46b32a8d92730e85696094120a787a", Version="", UserId="1de587e5988caadbe6f60a4f50d792e0"

That is one header with multiple values within it, I would like to report on "MediaBrowser Client" and "Device" in that string..

I know how to add this to my log file, but dont know how to have WLE grab this info and use it.. Any examples you can lend me please?
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