Annotations label geometry characteristics

Hi,

I achieved to change the leader line weight from 1pt to 3pt with graphical interface, however it is not possible to change the geometric shape weight itself. I searched in .xml file:

C:\Users\username\AppData\Roaming\ptc\Illustrate\CalloutTemplates.xml

Code exemple:

<annotation id="itm" hasLeaders="true">

      <name locid="DEFItemNumber"/>

      <description locid="DEFItemNumberDescription"/>

      <tooltip locid="DEFItemNumberTooltip"/>

      <thumbnail url="itm_prop.png"/>

      <leaders>

        <line-style weight="3pt" color="#000000" halo="false" dashes="Solid" start="none" end="none"/>

      </leaders>

      <label canEdit="false">

        <text font="Arial" size="10pt" color="#000000">

          <useproperty category="System" name="pvITM"/>

        </text>

        <shape type="circle" border="true"/>

      </label>

</annotation>

My question, how can I change the weight of the circle border?