C# WPF dynamic data as columnspan?

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WPF

grid

string

TextBoxBase

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Hello all,
I have a .xaml window with separate columns and a different textblock in each column. I am adding data to each textblock with a foreach dynamically. Is there a way I can add data dynimcally so I can do a columnspan so the data can go across each column like a columnspan in the .xaml?

<TextBlock x:Name="TxtProductQuantityData" Grid.Column="2" Grid.Row="4"/>
              <TextBlock x:Name="TxtProductTotalData" Grid.Column="3" Grid.Row="4"/>

          foreach(int quantity in receipt.ProductQuantity)
          {
              TxtProductQuantityData.Text += quantity + "\n";
          }
          foreach(decimal subtotal in receipt.ProductsSubtotal)
          {
              TxtProductTotalData.Text += subtotal + "\n";
          }

I would like to add a new value at the end of this foreach content that does a colspan.

What I have tried:

foreach data added and trying to do a columnspan dynamic but no luck