Currently, no, they can't be filled in online. Sorry.
However, the urge is building in me to give them the whole javascript treatment, making them editable. I did that for my
D&D 4e html sheet back when I was enthused about 4e, and could potentially pillage some of the coding from that to make it work. I'd certainly try to make it data-driven like my 4e sheet, where you can override or define your own classes, advanced moves, compendium classes etc.
(The 4e sheet was only shared with friends who were also playing 4e, and we all sort of moved on. I haven't touched it in ages, so it may have broken with browser updates and/or in different browsers.)
But if I did start on that, I wouldn't expect anything usable for a while - that 4e sheet sucked many, many hours. Obsession is a funny old thing...