No, but j2t and j2l (and other formats, like j2a) are fairly similar in how they're structured; see this thread for the details.

What'd you want to use a .lev editor for, anyway? I don't think there's many .lev levels that don't have a .j2l equivalent, and why would you want to make new levels in that format, seeing only an obscure and inferior version of JJ2 supports it?