You can't do it. Years ago I did some work for a publisher of folk songs and had to convert guitar chord symbols into a piano score. It's not just a matter of converting the symbols into notes, you also have to work out how the chord is played- is it strummed, picked, etc., and convert that into a pianistic style. There is a good piece of software called Virtual Guitarist that will generate MIDI information from chords and will simulate a finger-picking style. You could then feed the MIDI info into a scorewriting program like Finale and produce your score from that. But you have to be able to play the chords on a keyboard first.
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