[yocto] bitbake: display info for features in MACHINE_FEATURES and DISTRO_FEATURES

[Kaima Ko]

Hello list members,

Is there a bitbake command to display what involve in one specific feature declared in
MACHINE_FEATURES or DISTRO_FEATURES?

For example, I have these items in my MACHINE_FEATURES:
$  bitbake -e | grep MACHINE_FEATURES=
MACHINE_FEATURES="kernel26 usbgadget usbhost vfat ext2 screen alsa ethernet can touchscreen wlan rtc"

bitbake-layers show-recipes could show the related recipe for "screen":
$ bitbake-layers show-recipes | grep screen
Parsing recipes..done.
qt5ledscreen:
sato-screenshot:
screen:


But bitbake-layers show-recipes showed nothing for "kernel26", "usbgadget", "usbhost", "vfat", etc.
Which command I can use to obtain some info about these features, for example which packages/recipes were defined for the features?

Thanks in advance and regards,
Kaimi