Qt was actually part of webOS (they used it for something internally) but the problem was twofold - that it wass officially off-limits for 3rd party apps, and that it was a fairly old version (4.6.x). Now, if the thing is really open source, it should be fairly trivial to upgrade that version to 4.8 and make it available to all applications (ideally, with a bit more work, through a proper QPA backend).