Toolbox is a great tooling to create development containerised dev environment. I have been using this tool on x86_64 for 2 years at work.
With ppc64le, Fedora Infrastructure team does not support PPC64LE so users
have to build the base image manually:
git clone https://github.com/containers/toolbox.git
cd toolbox/images/fedora/f34
podman build . -t fedora-toolbox:34
Once done you could specify the image in toolbox command:
toolbox create --image fedora-toolbox:34
toolbox enter