Question: transformation for substructureFields field with child records

[bh-teufels]

is it possible to make a transformation for a substructureFields field with child records?

my data:

<equipments>
   <equipment>
      <code>airbag</code>
      <value>FRONT_AND_SIDE_AND_MORE_AIRBAGS</value>
   </equipment>
   <equipment>
      <code>alloyWheels</code>
      <value>true</value>
   </equipment>
   <equipment>
      <code>radio</code>
      <value>DAB</value>
   </equipment>   
[...]

my approach:

'xpath' => 'equipments/equipment',
        'substructureFields' => [
            'code' => [
                'field' => 'code'
            ],
            'value' => [
                'field' => 'value',
            ],
            'title' => [
                'field' => 'value',
                'transformations' => [
                    10 => [
                        'mapping' => [
                            'valueMap' => [
                                'DRIVER_AIRBAG' => 'Driver-Airbag',
                                'FRONT_AIRBAGS' => 'Front-Airbags',
                                'FRONT_AND_SIDE_AIRBAGS' => 'Front- and Site-Airbags',
                                'FRONT_AND_SIDE_AND_MORE_AIRBAGS' => 'Front-, Side- and additional Airbags',
                            ],
                        ],
                        'default' => ''
                    ]
                ],
            ],
        ],
        'children' => [
           [...]

i need to distinguish entries by code & value so for on record i have e.g.

<equipment>
      <code>airbag</code>
      <value>FRONT_AND_SIDE_AND_MORE_AIRBAGS</value>
</equipment>

for the other

   <equipment>
      <code>airbag</code>
      <value>FRONT_AND_SIDE_AIRBAGS</value>
   </equipment>

in my case i need to create / assign two different child records in my table "tx_myext_domain_model_equipment" how can i achieve that?