Add nfs support to "old" rasplex

I wouldlike to start my rasplex with PXE boot

To achive that I need nfs support.

From a rasplex runing with a SD I try to mount a nfs share (allready working on other raspberry with raspbien)

But get the "No such file or directory"

When checking in "/proc/filesystems" I did not see "nfs" ....

Any idea if it is possible to make nfs working on a "old" Libreelec version ?

Thanks

Thanks for help

I am using the "latest" release => 1.8.0-b (from octobre 2021)