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there is no direct link. Rexx was well documented and specified language, someone read said documentation and specifications and implemented a version for Amiga. RTFM used to be a very common happening back then...
Rexx made it to DOS 2000. ( DOS 7+ Rexx ). A powerfull scripting language.
The design for OS/2 was multi-tasking, and it shone at this, but the main use turned out to be mainframe connectivity, and it shone at that. BUT microsoft's preditaory practices, and the lag of OS/2 drivers essentially killed it.
I remember running Windows 95 and Windows 98, under warp, as well as a webserver/file server, and not noticing that other users were on, until they hit the disk...It was good, but Windows 2000 turned out to be rather mature, and skinny by todays standards.
Actually REXX was first included with IBM PC DOS 7.0. I know this because my first computer was an IBM that came with DOS 7.0
Just poking around the mainframe at work I have seen REXX supported on z/OS, but I think JCL is ubiquitously preferred.