Framing a window directly through a post in post-and-beam construction?
Removing the vertical post and finding some other way of supporting the roof beam will be complicated, specially since there is very little space between the window top and where the roof beam enters the wall. This is where you would need to insert a cross beam or similar to support the load from the roof. Needless to say, it will not be pretty and would probably still block a large part of your existing window.

Alternatively, you could consider moving the window. There seems to be sufficient space to the left of the photo. Although it would be a bit more work, no structural elements will be compromized, and most of the covering materials taken off to make space for the window could be re-used to fill up the gap on the other side.