Hi there,
At the moment, no, there isn't. I actually use a Chromebook about half of the time, and I have to type QWERTY. I had it working with Minimak for a while, but the procedure was exceedingly involved and it finally caused me to have to reinstall ChromeOS entirely, so I stopped bothering.
I submitted a request to the developers to support Minimak but they unsurprisingly turned it down. ChromeOS only offers a handful of keyboard layouts and they control the list pretty tightly. The only chance would be to get Xorg to include it in the X distribution, but I haven't pursued that.
Sorry.