The answered interested me too, so I searched around a little bit... Try the links from this post, I think they may help with your question: https://photo.stackexchange.com/questions/88080/how-do-i-adjust-overexposure-in-certain-parts-of-the-image-only-using-darktable
Oh that's awesome, thank you. Photography stack exchange will be my haunt for a while I feel.
just to note, some of the links were dead but you can easily find the pages they referenced (look at the url for the chapter/section numbers and then find it again in the most recent darktable manual). Good luck!
@yoshy started
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The answered interested me too, so I searched around a little bit... Try the links from this post, I think they may help with your question: https://photo.stackexchange.com/questions/88080/how-do-i-adjust-overexposure-in-certain-parts-of-the-image-only-using-darktable