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Idea Filament spool holder with integrated load cell which uses HX711 as an amplifier and feeds moonraker with the data. If this part is done, next thing would be to request a support for custom data panels in Mainsail GUI that would show data coming from moonraker. There are several available spool holder models with integrated load cells such as this one: https://github.com/VoronDesign/VoronUsers/tree/master/legacy_printers/printer_mods/Jink/VORON_2.1/Spool_Holder_With_Scale. Also there is an existing Octoprint plugin which does exactly this: https://github.com/dieki-n/Octoprint-Filament-Scale.
What is missing in Klipper is the support code for HX711 sensor. I've got the read out working on RPI via simple python script using https://github.com/tatobari/hx711py library following this guide: https://tutorials-raspberrypi.com/digital-raspberry-pi-scale-weight-sensor-hx711.
The implementation could be reused for several other features such as giving the user an error if approximated filament weight, coming from a slicer, is higher than what is remaining on the scale itself. Another idea is stopping/pausing the print if filament weight is not going down for a XY amount of time (this would mean there is a jam somewhere in the extrusion system / filament broke or is being grinded).