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magento 2: how to Add extra field in shippingMethods object in checkout page

I have simple question, I would like to load/add extra field called ‘delivery_date’ in checkout page, I shared below screenshot where I have to load, I do not want to load custom field in extensionAttributes object
enter image description here

Please give me advise for this/ any need to look class and override it ? please give me hint for this