Test for f2fs.mod in GRUB binary file from Bash shell?

[Frederick Grose]

I'd like to test for the presence of the f2fs.mod in a GRUB EFI binary file
from a general purpose Bash installation script for Fedora family LiveCD
.isos.

Could someone suggest a signature that I could test for from a hex dump or
some other method that might indicate that the f2fs module is present or
not?

Thanks,               --Fred