XEN package installing through yocto

Question

I am trying to add xen package to imx8mp through yocto.

1. in conf/local.conf, I have added this line DISTRO_FEATURES:append = " xen", but no package is coming in image what should iI do?
2. Also, I have tried with DISTRO_FEATURES_append = " xen", but no use? 3.if I add this line IMAGE_INSTALL_append = " xen", package is coming in rootfs file but no use as I am neither getting error package related to it.

I get this error as package not installed:

 u-boot=> run xenmmcboot
## Error: "xenmmcboot" not defined

Can any one help?

I tried to add through local.conf as already recipe for them are present.