Inquiry about Adjusting the Separator Line Position of Avalonia Semi TabControl Style（Avalonia Semi TabControl 样式分隔线位置调整咨询）

[dotnet9]

问题描述（中文）：
在使用 Avalonia 并应用 Semi 的 TabControl 样式时，如附图所示，当前分隔线位于控件的左侧。然而，像微信设置窗口那样，分隔线在 TabItem 的 Header 和 Content 中间的效果会更加美观和实用。想咨询一下在 Avalonia 中是否有相关选项或者方法能够实现类似微信设置窗口的这种分隔线效果？非常感谢！

Problem description (English)：
When using Avalonia with the Semi TabControl style, as shown in the attached figure, the current separator line is on the left side of the control. However, an effect like the separator line in the middle of the Header and Content of a TabItem in the WeChat settings window would be more aesthetically pleasing and practical. I would like to inquire if there are relevant options or methods in Avalonia to achieve a separator line effect similar to that of the WeChat settings window? Thank you very much!

[rabbitism]

Surprisingly this is hard to implement.