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You can do it with tone curve, but usually better result can be obtained with fill light slider (it works on different principle), just don't overdo it
What do you mean by it works on a different principle?
I don't know the ACR internals, but it looks like it works the similar way as function highlights & shadows in PS, just that you have only one slider here. It is basically an unsharp mask on luma channel with very large radius (PS highlight & shadows default is 30 pixels or so), so shadows are brightened locally, without affecting overall contrast of the picture too much, which would be tha case if you use tone curve and raise its bottom or middle part. All HDR software is working this way
Of course, you can combine this function with tone curve or brightness slider (which also affect tone curve) until you get most acceptable result