Have a look at Scaler VSTi
https://www.pluginboutique.com/product/3-Studio-Tools/72-Utility/3933-Scaler
It works how I suggested with samples to create any chords, strums or arpeggios.
It should not be too hard to do to give ANY held chord, strum, shot, arpeggio, picking/strum pattern.....

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Scaler_Samples.png (28.1 KB, 34 downloads)