Please accept my apology for delayed response. I have shared a piece of code in a text file with you. This will help you to achieve your requirements. Please share feedback with us if there is still an issue.
I have observed your comments. I like to inform that your chart is although Stacked bar chart but it has only one series in it that gives it a look for clustered bar. Please visit this link1 and link2 to for comparison of label position. I like to inform that if you use Clustered Bar chart then it does not have support of OutSide End label position by PowerPoint. The first image is depiction of that. However, if you use simple bar chart, then it has the desired support of OutSide End label position. I like to suggest you to use Bar chart to get desired label position as OutSide End label position is not possible in Clustered Bar even in PowerPoint.