How to get Data from Many-2-Many-Relation an ObjectBricks

When creating templates for document output, I would like to access the fields of ObjectBricks or many2many relations. With the relations, I can only access the path of the relation via Twig, but not the content of the object. With ObjectBricks I can't get any further via Twig. I understood that all objects that are addressed in a class are loaded. Or do I have to create extra snippets or views for each object, which are then included in the template? This then again in PHP and not in Twig?

Example : a product has a m2m relation to a class "Material" , which contains the field "Description".

{% set matdate = product.Material %}
{% if matdate %}                     
    {% for element in matdat %}
        
            {{ element }}

so far it works, but

{% if(item) %}
    {% for dat in element %}
        
           {{dat}}
        
    {% endfor %}
{% endif %}

When I then address the array, I get no content and no error.

Unfortunately, the descriptions from the Pimcore documentation don't help me with the ObjectBricks either. I can't figure out how to query them.

Maybe it's just a problem of understanding that is clear to everyone, but I can't find an answer.

Here is the dump:

      Pimcore\Model\DataObject\Data\ElementMetadata {#4103 ▼
      #elementType: "object"
      #elementId: "88"
      #fieldname: "Material"
      #columns: array:1 [▶]
      #data: []
      #dao: Pimcore\Model\DataObject\Data\ElementMetadata\Dao {#4078 ▶}
      #_owner: Pimcore\Model\DataObject\Implantat {#4079 ▶}
      #_fieldname: "Material"
      #_language: null
      elementType: "object"
      elementId: "88"
      fieldname: "Material"
      columns: array:1 [▶]
      data: []
      _owner: Pimcore\Model\DataObject\Implantat {#4079 ▶}
  _fieldname: "Material"
  _language: null