Need some help with using the REST platform for putting data into an attribute

I’m trying to retrieve the body of a webpage to scrape a single word, and then add x amount of characters that follow it to a sensor.

Using a regular scrape i ran into that entities can’t be longer then 255 chars, so i tried the rest platform option:

  - platform: rest
    name: "Food Waste Most Recent Collection"
    resource: "http://maps.croydon.gov.uk/aya/pages/aya/aya.html?tab=home&task=bins&utm_source=interaction&utm_medium=find-it&utm_campaign=waste-recycling-collection-dates"
    value_template: '{{ value_json["Food Waste"] }}'
    json_attributes:
      - "Food Waste"
    method: GET
    scan_interval: 65

Not knowing much about json, i probably did something in correct. I get this in my logs:

Rest result could not be parsed as JSON

Thank you for any pointers.

Dose the resource return json data?

Can you post a formatted example of the returned data?

I can’t get the resource to resolve if I visit it in a web browser, but that may be due to geoblocking.