I'm not sure within the NGFW GUI itself beyond policy optimizer (which I know isn't going to fulfill the exact thing you asked about), but I know for a fact expedition is able to show shadow rules and merge them. You can filter based off common fields, click analyze, and review the criteria you wish to replace/standardize.
So if you have 2 rules, one that is source 10.0.0.1 dest 22.214.171.124 port 443 and the second rule src 10.0.0.0/8 dest 126.96.36.199, 443 expedition will merge it into 1 rule and then you are able to remove the criteria you don't want to keep.
So in that way you can export the current config, clean it up in expedition, and then import it back in.
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