Step 1: Enable "Custom properties" for your site| plausible.io
You can attach custom properties (also known as custom dimensions in Google Analytics) when sending pageviews or custom events to Plausible in order to create custom metrics. Custom properties allow you to collect and analyze metrics that we don't track automatically.| plausible.io
If you use the custom events feature, then these count towards your billable monthly pageviews.| plausible.io