finding each of oCoords in a check box group

How can I can find the  oCoords (field.rect) information for each check box in a check box group?

I'm only able to find the first set of coordinates. It seems that the function getNthFieldName is also seeing the entire checkbox group as 1 field. I tried to play around with exportValues  and field names but I was never able to locate the .rect information for all exportValues.

I have to change hundreds of check box groups into radio buttons. I made a lot of progress thanks to this forum and older post but at the moment I can only create all the correct radio buttons at the location of the first checkbox group field. This means I have to manually drag and drop them to the correct field location.

Example:

In the example below you can see I can only find the location of 1 box even though there are 3

var fieldName = getField("Check Box Group");

fieldName.rect
279.6754150390625,313.5375061035156,297.6754150390625,295.5375061035156

fieldName.exportValues
1,2,3