The columnize element, will split the content in two columns, you wont have control over what point the content is being devided as we explained previously.
Based on your layout, you won't fina an option to add a row as you are already inside a row which is devided in two columns.
left column with 2/3 right columns 1/3.
You cannot devide the right column on 1/6 + 1/6 without chaging the whole column including the content above.
The alternatives are:
1- Add a complete new ROW and devided it on 2/3 + 1/6 + 1/6
2 - Or you can float your image to the left, if your intention is to have an image on the left and text wrapped on the right.
For that you can add to your text element
<img src="http://folder/image.png" style="float: left;"> Your text here
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