How to bind a ValueConverter source to target cell from style

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WPF

Hi!

I have a DataGrid with some columns. I need to color part of the columns based on their value. Thus I have made an IValueConverter implementation. I added a background property setter to the style:

<Style x:Key="CenterCellStyle" TargetType="{x:Type DataGridCell}">
  <Setter Property="Background" Value="{Binding ???, Converter={StaticResource ResourceKey=AlarmConverter}}" />
...

The affected cells look like this:

<DataGridTextColumn Header="Black" Binding="{Binding [1]}" Width="100" CellStyle="{StaticResource CenterCellStyle}"/>

If I write in place of ??? any property name of the class bound to the grid, all affected cells in the row will be colored based on that property. But I need to color every cell based on it's own value.

What should I write in place of ??? ?

I have found here[^] the following expression that looked promising: {Binding Text, RelativeSource={RelativeSource Self}}, but it is not working - I suppose because DataGridTextColumn has no Text property, and I should bind to the field bound to the cell, but with some relative reference. But don't know how.

Please advice. Thank you.