怎么用tcolorbox 宏包制作含有ellipsoid形状标题盒子

\documentclass{article}

\usepackage{amsmath, amssymb}

\usepackage[most]{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{calc}
\makeatletter
\def\pgfgetnodeheight(#1)#2{
  \path ($(#1.south) - (#1.north)$);
  \pgfmathsetmacro#2{veclen(\pgf@x, \pgf@y)}
  \edef#2{#2pt}
}
\def\pgfgetnodewidth(#1)#2{
  \path ($(#1.east) - (#1.west)$);
  \pgfmathsetmacro#2{veclen(\pgf@x, \pgf@y)}
  \edef#2{#2pt}
}
\makeatother

\definecolor{tcbline}{RGB}{23, 139, 23}

\NewDocumentEnvironment{mybox}{O{}+b}{%
    \begin{tcolorbox}[
        breakable,
        enhanced,
        colbacktitle = white,
        coltitle = black,
        colback = white,
        colframe = tcbline,
        boxrule = 1pt,
        arc = 0pt,
        top = 2ex,
        attach boxed title to top left = 
        {
            xshift = 2em,
            yshift=-\tcboxedtitleheight/2,
            yshifttext=2mm-\tcboxedtitleheight/2
        },
        boxed title style = 
        {
            frame code = 
            {
                \pgfgetnodeheight(frame)\nHeight
                \pgfgetnodewidth(frame)\nWidth
                \draw[tcbline, thick] (frame.center) ellipse[x radius = \nWidth/2 - .1cm, y radius = \nHeight/2 + .1cm];
            },
            interior code = 
            {
                \pgfgetnodeheight(interior)\nHeight
                \pgfgetnodewidth(interior)\nWidth
                \fill[tcb fill interior] (interior.center) ellipse[x radius = \nWidth/2 - .07cm, y radius = \nHeight/2];
            }
        },
        #1
    ]
    #2
    \end{tcolorbox}
}{}


\begin{document}

\begin{mybox}[title = Example]
    \begin{center}
        Content
    \end{center}
\end{mybox}

\end{document}