Why doesn't /proc/cpuinfo contain fp16 if FEAT_FP16 is supported?

Question

I know that in my ARM FEAT_FP16 is supported.

I expect seeing fp16 in the list of features reported by cat /proc/cpuinfo:

$ cat /proc/cpuinfo | grep fp | sort -u
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma dcpop asimddp asimdfhm

Here we see that fp16 is not present in this list. Why?