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I don't think it's possible to get something to appear in the Hatch pattern choices that's not in an actual.pat-file definition. I suppose you could do a Tool Palette item or other menu entry that calls up SuperHatch with it. But would it be acceptable to have the curves in that pattern made of small straight segments? I have, for example, a true Hatch pattern definition that makes this: and I'm sure something pretty much exactly like your image could be constructed on similar lines, if it looks circular enough for you at the scale you would use. The inner 'circles' in the patterns are actually dodecagons [12-sided], and the outer 'circles' are 24-gons.

They look pretty 'round' until you Zoom in close enough to distinguish the edges. Wrote: Yes that would be acceptable but how do I set the pattern with so many lines? Is there a way to do it or to get it easier than writing it all 'by hand'? There are pattern-generating programs out there, though I find definitions generated by them sometimes to be far more complex than necessary, so I haven't used them [maybe someone will jump in]. But it might not be too hard to make that pattern starting with parts of mine as a basis. In order to give it a try, I need to know one thing: What is the ratio of the center-to-center spacing of the Circles in your image to their radius? It looks to be about 2.5-to-1, but I don't want to assume.

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And whatever it is, is it critical that it be exactly that? It may be that a definition can be much simpler with a ratio that's just-slightly different.