Have a time beam view of Tibber "Price level" attribute

Ah! Ok, just the core history strip chart.

For that you will have to create a template sensor from your attribute. Something like this:

configuration.yaml

template:
  - sensor:
      - name: Price Level
        state: "{{ state_attr('sensor.your_sensor_here','your_attribute_here') }}"

Do a config check and restart if it passes.

You can then add this sensor to a history graph.