Edit: Just re-read your original post/question. It sounds like you have already sorted out the sensing as you indicated your are receiving "watts". So correct me if I'm wrong - you are looking for a Node-RED node to process the "watts" to show the consumption over a period of time?
Might be worth looking at this node...
Sorry - this might not be relevant to your needs.
Have you looked at the PZEM-004T (available on AE and Banggood as well as other stores) ?
The split-ring clamp goes around the 'live' cable of the device you want to measure.
The unit provides a TTL Mod-Bus interface that can be connected to low-cost microcontroller (e.g. ESP32-S2-Mini, ESP32-C3-Super-Mini, etc..) which can be flashed with Tasmota to send the readings to Node-RED using MQTT protocol. Here's a link to one of my old projects.
