En réponse à Jiří Vaněk.
We do not have a recommended way without a plugin, a snippet would be fairly complex which is why we recommend the plugin. We also recommend taking a look at our list of how many plugins can be installed on a site to help remove your fear of having too many plugins 
https://www.wpbeginner.com/opinion/how-many-wordpress-plugins-should-you-install-on-your-site/