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I believe that what you are seeking is called an "Application for Judgment against Garnishee." See DC rule 69-I(e).
I've searched the internet, and while I have found some similar forms for other jurisdictions, those forms do not meet the precise requirements of the DC Superior Court. I don't have a template available, however, I believe you can obtain one from the D.C. Practice Manual (DC Bar 2015). You're probably not interested in paying $270 for the publication, which mean that you will need to visit a local law library. I suggest that you call the library before you visit, and ensure that the library has the applicable template, so that you don't waste your time and parking fees.
I wish I had the form, but I'd have to draft one from scratch, and that would take me about an hour, which wouldn't be cost effective for you.
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