TL;DR
This will give you OpenGL hardware acceleration in any client you choose to run with systemd-nspawn using the host GPU, as long as the client supports virgl.

Host
git clone https://gitlab.freedesktop.org/virgl/virglrenderer.git
cd virglrenderer
meson --prefix=/usr/local -Dbuildtype=release build
cd build
sudo ninja install

start service on Host
/usr/local/bin/virgl_test_server --use-gles

Modify 'nspawn' to connect to external X server aka host
--bind=/tmp/.X11-unix
--bind=/tmp/.virgl_test

The binding of .X11-unix allows the client to run X applications on the host without Xephyr, but still have to export DISPLAY=0
If using Xephyr bind '.virgl_test' rw and export DISPLAY=:1

----- virgl start ----- ( Note the mesa version might already come with 'virgl', but might run better with upgrade )
on client
sudo apt-get install libxcb-randr0-dev libxrandr-dev
libxcb-xinerama0-dev libxinerama-dev libxcursor-dev
libxcb-cursor-dev libxkbcommon-dev xutils-dev
xutils-dev libpthread-stubs0-dev libpciaccess-dev
libffi-dev x11proto-xext-dev libxcb1-dev libxcb-*dev
bison flex libssl-dev libgnutls28-dev x11proto-dri2-dev
x11proto-dri3-dev libx11-dev libxcb-glx0-dev
libx11-xcb-dev libxext-dev libxdamage-dev libxfixes-dev
libva-dev x11proto-randr-dev x11proto-present-dev
libclc-dev libelf-dev git build-essential mesa-utils
libvulkan-dev ninja-build libvulkan1 python-mako
libdrm-dev libxshmfence-dev libxxf86vm-dev
python3-mako python3-pip llvm-dev

sudo pip3 install meson

git clone https://gitlab.freedesktop.org/apinheiro/mesa.git mesa
cd mesa
meson --prefix=/usr -Dosmesa=gallium -Dplatforms=x11,drm,surfaceless -Ddri-drivers='' -Dgallium-drivers=swrast,virgl -Dbuildtype=release build
cd build
ninja -j4
sudo ninja install
----- virgl end -----

compile systemd to make box86 and chromium work, as it seems Chromium also need more exposed CPU
functionality via kernel syscall to work with Virgl
sudo apt install gperf libcap-dev
git clone https://github.com/systemd/systemd.git
meson --prefix=/usr/local -Dbuildtype=release build
cd build && ninja -j4

Note do not install systemd, we just need systemd-nspawn

edit 'nspawn' systemd-nspawn command to:
sudo /home/pi/Development/systemd/build/systemd-nspawn ( or where you build systemd )

Add the following in .bashrc on client
#export DISPLAY=:0 # for X host
export DISPLAY=:1 # for Xephyr
export LIBGL_ALWAYS_SOFTWARE=1
export GALLIUM_DRIVER=virpipe

Note that if virgl_test_server crash, one will have to restart the client, as the binding of '.virgl_test' unix socket becomes invalid.

For fixing hardware acceleration in Chromium add the following
chromium-browser --ignore-gpu-blacklist --disable-gpu-compositing

@Botspot

Chromium Aw, Snap! error #3

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