The constrained pole vector’s end position is driven by the target point, but you can offset the end position from the target point. To do so, edit the constraint Offset and Offset Polarity attributes with the Attribute Editor.
To offset constrained pole vector’s end position
By default, these attributes are not displayed as channels in the Channel Box. If you’d like to control them from the Channel Box, you can add them by using the Channel Control editor (select Window > General Editors > Channel Control.).