utu:AncestorBinding or ItemControlBinding from Data template to parented Grid.ColumnDefinition.Width

[DevTKSS]

What would you like to be added:

Sample for how to access the ColumnEidth of the Patented Grid.ColumnDefinitions.ColumnDefinition[0]. ActualContentWidth (or similar just to get the available width (recognizing defined padding!) from there.
My attempt is following one, but struggling on the effective type which could be ColumnDefinition but no selection of which I want? 🤔 maybe the collection? And which property would be the fitting one?

<Page.Resources>
   <DataTemplate [...]>
      <StackPanel Width="{utu:AncestorBinding AncestorType=

Grid, ColumnDefinition or ColumnCollection might be possible...

Why is this needed:

Had multiple applications where this would be nice to have known the solution for this

For which Platform:

• WebAssembly
• Android
• iOS
• macOS (AppKit)
• Mac Catalyst
• Skia
  • WPF
  • GTK (Linux)
  • Linux Framebuffer
  • Tizen
• Windows

Anything else we need to know?

I would be willing if anyone can help me solve this knowledge void, to add it to the docs for future people searching for it