Magento 2: Import store configuration using csv

Question

I want to import the configurations using CSV in Store -> Config under my module. After importing, it should set in the store config fields. How can I achieve that?

I have referred this link Here. I'm trying to add the Import button using the code in the link, but it doesn't show anything in the configuration.

<group id="import_setting" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
     <field id="import" translate="label" type="Magento\OfflineShipping\Block\Adminhtml\Form\Field\Import" sortOrder="6" showInDefault="0" showInWebsite="1" showInStore="0">
        <label>Import</label>
        <backend_model>Magento\OfflineShipping\Model\Config\Backend\Tablerate</backend_model>
    </field>
</group>

Please let me know if anyone has any ideas.

Thanks in advance.