Hi, I am interested in such package too, please let me know how can I help.
FWIW i did a copr using the binary release from the dhall-haskell release page here: https://copr.fedorainfracloud.org/coprs/tdecacqu/dhall/builds/
And I am also working on Ansible and Openshift binding here: https://github.com/TristanCacqueray/dhall-ansible and there: https://github.com/TristanCacqueray/dhall-openshift