Yes, it is, but with a payware version available as part of the sim, why would anyone want to take on such a project?
Not everyone is going to pay a lot of money for Premium Deluxe, and the Dreamliner included in it is not worth that amount. The 787-8 / 787-9 version is missing from the simulator, or maybe someone can create (or maybe even copy?) Dreamliner. Unfortunately, I can't program, but maybe some good soul would have some free time and would create such a work Have a nice day!