The short answer is - that feature does not exist - probably because it is pretty much an impossible task.

I don't see how one could use a morphs verticy values  to  recreate a particular value for magnet, magnet field and magnet base. Some of the folks here who are smarter about math will give you the proper terminology,  but  magnet params, in your scenario, are 3  unknown variables, and the morph params could be considered one known variable.  How do you create the math for 3  unknown  to  properly reproduce the one known?
I suppose a genious could create a program  that creates a magnet based on morph info for you if they were able to
A) unlock the underlying math of Poser magnet technology and
B) you would probably have to know how to provide  2 of the 3  unknown  variables of the magnets, anyways.  and
C) very few morphs , if any, can  be done with just one magnet - magnet fields are limited to  being spherical- I have tried to  magnetize a magnet field to make it something other than  spherical-it doesn't work

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