How to to have nested namespace in netsim device?

[adrikacang]

I tried to build a netsim that has something like this for the template

<main namespace="http://main.com/ns/yang/main"
           <submain namespace="http://main.com/ns/yang/sub-main">
                   .....
            </submain>
</main>

Is it possible to have this name space? I tried by using augment but seems the submain module is not loaded in main module. I can't find it when setting the cli

in my yang

main module yang 
module Main {
  namespace "http://main.com/ns/yang/main";
  prefix main;

  import ietf-inet-types { prefix inet; }

  revision 2025-09-04 {
    description "Use augmentation";
  }

  grouping native {
    container native {
      container interface {
        container GigabitEthernet {
          list name {
            key "name";
            leaf name {
              type string;
              description "Interface name suffix (e.g., 0/0/0)";
            }
            leaf description {
              type string;
              description "Interface description";
            }
          }
        }

and this is the inner module yang

module submain {
  namespace "http://main.com/ns/yang/sub-main;
  prefix sub-main;

  grouping config-l2-grouping {
      list neighbor {
        key "ip";
        description "Neighbor PE for VFI";
        leaf ip {
          type string;
          description "Neighbor IP address";
        }
        leaf pw-id {
          type string;
          description "Pseudowire ID (e.g., concatenation of bd and vlanid)";
        }
        leaf encapsulation {
          type enumeration {
            enum mpls;
          }
          description "Encapsulation type";
          default mpls;
        }
      }
    }
  }

  augment "/main:native/main:interface/main:GigabitEthernet" {
    container {
        ........................
   }
  }