DIY livingroom window shelf

As my addiction to plants grows, I have begun to run out of spaces to put them. I have a beautiful livingroom window, that I would love to build a shelf acros...however I just don’t know how to support it in the middle? Any ideas would be greatly appreciated!
q diy livingroom window shelf
So there is wood on either side of the windo, but the middle has nothing to screw into?
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