Always starting by assuming someone in another language wants to do the same ;)
googling...��fortran ffi python
second result... https://maurow.bitbucket.io/notes/calling_fortran_from_misc.html

I only skimmed quickly, but it seems to hint how to do it from Pharo UFFI.

cheers -ben

P.S. Interesting concept.�� All too often its C libraries used as an example,
but IIUC, Fortran still provides the highest performance of all the numerical libraries, with a many-year pedigree of reliability.