How to apply auto tune to part of an image in Lightroom Classic

"My current workaround is to crop the image, apply auto tune and crop again."

I don't think you can do any better than this with the current LR features. Does this method give you the image quality you want?

You could post a feature request in the official Adobe feedback forum, where Adobe wants all product feedback (bugs and features): https://feedback.photoshop.com/photoshop_family/categories/photoshop_family_photoshop_lightroom

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Hi Dan, 

We do not have an option to apply Auto adjustment to a part of an image. You can isolate a part of the image for editing by application an adjustment brush and editing only the part that has the brush applied to it however we do not have the option for Auto adjustment when applying an adjustment brush and you would need to made the edits manually.

You can raise this as a feature request at the link below. This forum is monitored by our developers and they can check if the option can be included in a future update.

https://feedback.photoshop.com/photoshop_family/categories/photoshop_family_photoshop_lightroom

Regards,

Nikunj