Don’t think it should take too much work. The request comes from a developer, so why not ask the developer to write it?
I think TAATOOLS has something to do this.
If you were to do it yourself,
(1) make a physical file which included the Journal fields and then all the fields of the file.
(2)dspjrn data to an outfile.that file with *NOCHK
(3)cpyf outfile to your pf with *NOCHK