[texworks] using asymptote in typeset menu

[Kresimir Demeterfi]

I am trying to add asymptote to the Typeset Menu on the Mac but do not know how. I can do it in TexShop but not in TeXworks. GIven that asymptote is widely used for drawing when typing in TeX it would be useful to add it as part of standard menu in the future, just like you have MakeIndex and BibTeX now. 
Thank you for your help.
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