You can modify this template to set the default shipping address.

vendor/magento/module-checkout/view/frontend/web/template/shipping-address/address-renderer/default.html

Find out the template and modify it like this

<div class="shipping-address-item" data-bind="css: isSelected() ? 'selected-item' : 'not-selected-item'">
   
    <div>
        <span>Street: </span>
        <span>Your Specific Street</span>
    </div>
    <div>
        <span>City: </span>
        <span>Your Specific City</span>
    </div>
</div>

You can modify this template to set the default shipping address.

vendor/magento/module-checkout/view/frontend/web/template/shipping-address/address-renderer/default.html

Find out the template and modify it like this

<div class="shipping-address-item" data-bind="CSS: isSelected() ? 'selected-item' : 'not-selected-item'">
    <div>
        <span>Street: </span>
        <span>Your Specific Street</span>
    </div>
    <div>
        <span>City: </span>
        <span>Your Specific City</span>
    </div>
</div>