That's what dehaze does, yes It's in GMIC-Qt under details. You can try and do it just with contrast if it's minor. I tried contrast and it blew out part of the sky.
Dehaze will make your picture darker on default, so you may need to move the sliders a bit so it isn't so strong.
Edit:
Is this what you are looking to do. I just did a quick mock up after your last question
Dehaze will make your picture darker on default, so you may need to move the sliders a bit so it isn't so strong.
Edit:
