Unfortunately, after a great search, I still could not find a way to do this exactly the way I wanted (as a separate column). The best thing, as Darre pointed out, is to include it manually in the description. There are two ways to do this. Using the <See> tag or using the <seealso> .
The <See> can be used as such:
/// <summary> /// Assessment ID to be copied /// <see cref="System.Int32">System.Int32</see> /// </summary>
And it produces the following:

The <seealso> can be used as such:
/// <summary> /// Assessment ID to be copied /// <seealso cref="System.Int32"/> /// </summary>
And it produces the following:

This is a bit redundant as you have to go into the property to see it, which already displays the type of the property.
I hope this answer becomes obsolete at some point when it will be implemented in the "sand castle". But now it can help others, as it helped me.
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