Increase and decrease horizontal overline and the vertical distance

Question

If I have this MWE,
documentclass[12pt]{article}
usepackage{amsmath,amssymb}

begin{document} 
[overline{left(frac{a}{b}right)}]
end{document}

it is possible increase (without to use a rule-macro) the lenght of overline and the vertical distance like the image below?

Steven B. Segletes · Accepted Answer

Here, Xoverline pads the content vertically by Xgap and the overline gets extended by Xtend.  Note: the vertical padding is applied to top and bottom of argument...this could be problematic if you wish to apply a subscript outside of the Xoverline.  If so, let me know, and I will attempt to address.
In the MWE, 2pt are added as vertical gap, and the overline length is shrunk by 2pt.
documentclass[12pt]{article}
usepackage{amsmath,amssymb,stackengine,scalerel}
newlengthXgap
newlengthXtend
setlengthXgap{2pt}
setlengthXtend{-2pt}
newcommandXoverline[1]{%
  overline{ThisStyle{kernXtend
  ensurestackMath{addstackgap[Xgap]{SavedStyle#1}}
  kernXtend}}}
begin{document} 
[
overline{left(frac{a}{b}right)},
Xoverline{left(frac{a}{b}right)}
]
end{document}

Increase and decrease horizontal overline and the vertical distance

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