We already have wonderful Filter available. However, it requires manually creating new sensor entities and disabling recording of original ones. It can be problematic if one has many sensors that needs filtering.
I am proposing to add sensor properties to include filtering. It could also help significantly with down sampling that is often requested. Finally, it could have easier GUI integration and make it more accessible. It could have performance penalty, however, if only enabled as needed, it may actually be better than redefining sensors.
I saw similar in ESPHome: https://esphome.io/components/sensor/index.html