I figured it out, everything actually works out of the box.
This script should get things going:
#!/bin/bash
# This script presumes a RL 8.4+ "Minimal Install" ready machine which has been prepped # for OTP install in IPA. Also, /export is the dir/volume being exported as NFS.
dnf upgrade -y
dnf install -y ipa-client ipa-client-install -U -w myonetimepassword
dnf install -y nfs-utils nfs4-acl-tools
cat <<EOF > /etc/exports /export *(rw,sec=sys,no_subtree_check,root_squash,async) EOF
systemctl enable --now nfs-idmapd.service systemctl enable --now nfs-server.service
exportfs -arv
firewall-cmd --permanent --add-service=nfs firewall-cmd --permanent --add-service=rpc-bind firewall-cmd --permanent --add-service=mountd firewall-cmd --reload
reboot