Currently the “Only one wall on top surfaces” option is only configurable globally or per-object. It cannot be applied to only one area of a single connected object by using modifiers or by splitting the object into parts. The option just isn’t present under “Quality > Advanced” at all for parts or modifier.
In my case I’d like to enable this option for most of the object for the usual nice surface finish reasons, except for either the entire or sections of the outermost ring of the part where the multiple walls on the top layer help to successfully print a tricky overhang wall and connected bridging (the circled areas in this screenshot).