Is it possible to read data in xml file ?. For example I create custom block like so:

<referencecontainer name="sidebar.knowledge">
<block class="Magento\Cms\Block\Block" name="knowledge-base">
<argument name="block_id" xsi:type="string">knowledge-base</argument>

and variable in config system.xml custom module like:

<group id="general" translate="label" type="text" sortorder="10" showindefault="1" showinwebsite="1" showinstore="1">
<field id="mfx_knowledge_block" translate="label" type="text" sortorder="50" showindefault="1" showinwebsite="1" showinstore="1">
<label>Knowledge block mfx</label>

Now can I read it in my xml file ?

To be like:

<argument name="block_id" xsi:type="string">{mfx_tab/mfx_knowledge_block}></argument>

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