magento2 – How to parse json with knockout in order grid template

I added a custom template to the order grid:

<listing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
    <columns name="sales_order_columns">
        <column name="order_lines" class="QxsSerialCodeUiComponentGrid">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="bodyTmpl" xsi:type="string">Qxs_SerialCode/grid/cells/html</item>
                    <item name="disableAction" xsi:type="boolean">true</item>
                    <item name="label" xsi:type="string" translate="true">Order lines</item>
                </item>
            </argument>
        </column>
    </columns>
</listing>

The field is populated with an json that is saved in database.

How can I parse the json so it becomes usable with knockout in my custom theme?