After researching for long time, I found the solution by overriding the module.
Please check the below code,
create module.xml file on app\code\Vendorname\Affirm\etc
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Vendorname_Affirm" setup_version="1.0.0">
<sequence>
<module name="Astound_Affirm"/>
</sequence>
</module>
</config>
create catalogstaging_category_update_form.xml on this path, app\code\Vendorname\Affirm\view\adminhtml\ui_component
<?xml version="1.0" encoding="UTF-8"?>
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
<fieldset name="custom">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="label" xsi:type="string" translate="true">Custom</item>
<item name="collapsible" xsi:type="boolean">true</item>
<item name="sortOrder" xsi:type="number">100</item>
</item>
</argument>
<field name="affirm_category_mfp">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">1</item>
<item name="dataType" xsi:type="string">string</item>
<item name="formElement" xsi:type="string">input</item>
<item name="label" xsi:type="string" translate="true">Multiple Financing Program value</item>
</item>
</argument>
</field>
<field name="affirm_category_mfp_type">
<argument name="data" xsi:type="array">
<item name="options" xsi:type="object">Astound\Affirm\Model\Entity\Attribute\Source\FinancingProgramType</item>
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">2</item>
<item name="dataType" xsi:type="string">string</item>
<item name="formElement" xsi:type="string">select</item>
<item name="label" xsi:type="string" translate="true">Multiple Financing Program type</item>
</item>
</argument>
</field>
<field name="affirm_category_mfp_priority">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">3</item>
<item name="dataType" xsi:type="string">string</item>
<item name="formElement" xsi:type="string">input</item>
<item name="label" xsi:type="string" translate="true">Multiple Financing Program priority</item>
</item>
</argument>
</field>
<field name="affirm_category_mfp_start_date">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">4</item>
<item name="dataType" xsi:type="string">datetime</item>
<item name="formElement" xsi:type="string">date</item>
<item name="label" xsi:type="string" translate="true">Start date for time based Financing Program value</item>
</item>
</argument>
</field>
<field name="affirm_category_mfp_end_date">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">5</item>
<item name="dataType" xsi:type="string">datetime</item>
<item name="formElement" xsi:type="string">date</item>
<item name="label" xsi:type="string" translate="true">End date for time based Financing Program value</item>
</item>
</argument>
</field>
<field name="affirm_category_promo_id">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">6</item>
<item name="dataType" xsi:type="string">string</item>
<item name="formElement" xsi:type="string">input</item>
<item name="label" xsi:type="string" translate="true">Affirm Promo ID</item>
</item>
</argument>
</field>
</fieldset>
</form>
Please create a custom module and put this code in respective files. Please let me know if this code does not works.
Thanks,