Yes, you can track offline interactions with Google Analytics 4 (GA4) using the measurement protocol.
The measurement protocol is a way to send data directly to Google Analytics servers from any device, such as a point-of-sale (POS) system or a phone call tracking system. By using the measurement protocol, you can track offline interactions, such as phone calls, store visits, and transactions, and send this data to GA4 to be included in your reports.
To track offline interactions with GA4, you need to set up an App+Web property in GA4 and configure the measurement protocol for your offline interactions. You will also need to create custom events and parameters to track the specific interactions you want to measure.
It is important to note that tracking offline interactions with GA4 requires a little bit of technical knowledge and setup, and you will need to have a developer or technical expert to help you with the implementation. Also, it is important to note that the measurement protocol is not supported in all GA4 properties, and you need to have a Google Analytics 360 subscription or a Google Workspace plan to use this feature.