makefile – Openwrt: how to write dependency for specific component of busybox

I want pgrep to be present in the system, and declare it within DEPENDS:= of my package. It is located at

│ Symbol: BUSYBOX_CONFIG_PGREP [=y] │
│ Type : bool │
│ Defined at package/utils/busybox/config/procps/Config.in:68 │
│ Prompt: pgrep (6.5 kb) │
│ Depends on: (PACKAGE_busybox [=y] || PACKAGE_busybox-selinux [=n]) && BUSYBOX_CUSTOM [=y] │
│ Location: │
│ -> Base system │
│ (1) -> Process Utilities

but whatever I try in the DEPENDS:=, configuration menu gives error that the dependency does not exist. How to write the “path” to the pgrep in DEPENDS:= properly?