When I try to look at a manpage from openssl, e.g. man sha256 I get:

FSUMF061 Cannot format /usr/local/ssl/man/man1/sha256.1

Using the file command: file /usr/local/ssl/man/man1/sha256.1 I get:

/usr/local/ssl/man/man1/sha256.1: nroff, eqn, or tbl text input text

When scanning the rocket ported tools for files which are nroff, eqn, or tbl text input text
I see that most if not all man pages from php, openssl, libssh2 are not usable.

A possible fix from my side is to dowload the man page to my laptop (using ascii conversion) and run something like:

mv openssl.1 openssl.1.bad
groff -mandoc -Tascii openssl.1.bad > openssl.1

and then upload to the z/OS host.