could you create a sensor for each of the attributes and then add that sensor to a graph?
sensor:
- platform: template
sensors:
zillow_valuation_high:
friendly_name: "Zillow Valuation High"
unit_of_measurement: '$'
value_template: "{{ states.sensor.zestimate_your_house_address.attributes.valuation_range_high }}"
zillow_amount:
friendly_name: "Zillow amount"
value_template: "{{ states.sensor.zestimate_your_house_address.attributes.amount }}"
the instructions below can show how to put the numbers on a 30 day graph