Hello,

You can enable the Manage stock and when the product is of stock, the appropriate label would appear.

You can create an attribute with your notifications and activate the label of the attribute, navigate to Products > Attributes > enter the attribute and disable “Show attribute label on products”

You will have to configure all manually. If it does not work for you, try to find a plugin as the default Woocommerce does not provide the option.

Best Regards