'Loop Ansible hostvars from inventory in jinjar2 template

I'm new to Ansible and just having a problem with variables in inventory. In the inventory I have different variables which contain MAC or IP addresses. I want to loop through them and, if they are present, process them in a jinjar2 template.

My inventory (shortened):

net6_prd:
      children:
        net6_prd_test:
          hosts:
            net6-tst-01: 
              eth1_mac: "001 eth1 mac" 
              eth1_ip: "001 eth1 ip"  
              eth2_mac: "001 eth2 mac"
              eth2_ip: "001 eth2 ip"
            net6-tst-02: 
              eth1_mac: "002 eth1 mac"
              eth1_ip: "002 eth1 ip"
              eth2_mac: "002 eth2 mac"
              eth2_ip: "002 eth2 ip"

In the jinjar2 template I use the following loop:

{% for ihost in hostvars -%}
 # example={{ hostvars[items]['eth1_mac'] }}
{% endfor %}

Unfortunately, this does not work. Ansible reports that the variable does not exist.

FAILED! => {"changed": false, "msg": "AnsibleUndefinedVariable: 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'eth1_mac'"}

I have also tried to run via groups[net6_prd] over all host in net6_prd, but this doesn't work either. Anyone else have any ideas what is wrong with my loop?

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'Loop Ansible hostvars from inventory in jinjar2 template

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