[NTG-context] Fonthandling/protrusion question: handling of left margin

Short question about the font feature protrusion. This handles certain characters that get shifted into the right margin to make a more visable straight right margin. But can this font feature also handle left margin? For example, sentences that start in the left margin and begin with a quotation, there you would want the same effect also in the left margin. I currently use \kern-1ex to achieve the same effect for a sentence that commences on the left margin and starts with a quotation. Greetings, Rob