I know there's a post on this somewhere else on the forums, but I couldn't find it with a search just now, but there is one somewhere
if it's a straight-ish line you could easily do it with a slide transition between an image without line to one with the line.
if it's more random than that I'd try making the line in Photoshop, importing this to your timeline then revealing it with a track-Matte.
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