This Magento 2 module add the option to show social buttons or more extras with ease.

So you can get the whatsapp number from the Stores > Config. Instead using static block or hard code it in your template directly.

Install the package via;

composer require siteation/magento2-storeinfo-extra
bin/magento module:enable Siteation_StoreInfoExtra
bin/magento setup:upgrade

By default this module loads nothing.

Use one of the samples to get started.

After this Enter your information in the available options found in Stores > Configuration > General > General > Store Extra information

<referenceContainer name="footer">
    <block
        name="footer.store.socials"
        as="footer-store-socials"
        template="Siteation_StoreInfoExtra::hyva/socials.phtml"
    />
</referenceContainer>

<referenceContainer name="footer">
    <block
        name="footer.store.socials"
        as="footer-store-socials"
        template="Siteation_StoreInfoExtra::luma/socials.phtml"
    >
        <arguments>
            <argument name="viewModelStoreInfo" 
                xsi:type="object">Siteation\StoreInfoExtra\ViewModel\StoreInfoExtra</argument>
        </arguments>
    </block>
</referenceContainer>

Incase you want to add your own fields, you need create your own module, that has at least contains the etc/adminhtml/system.xml file.

In here you can create new fields, just as this module is doing.