Hello @Name,
The Dexcom One+ application does allow you to manually enter the units of insulin injected, differentiating between rapid and basal.Furthermore, if you have a Novopen you can automatically synchronize and transfer the injected units via NFC.
Additionally, you can add blood glucose measurements from a glucometer, amount of carbohydrates ingested, activity data (sports), notes, and fasting glucose.
If your cell phone doesn't work, you can use the receiver, which they give you in training or in the first shipment.You can also put insulin information on the receiver (novopen functionality not available) although I understand that it is not as practical as the mobile phone.
If it is a new mobile model from a well-known manufacturer, it is possible that they will incorporate it soon.