How to import the value of the length of estimated filament used

Hi guys, I am using REST API to get the value of length of estimated filament used and show it as one of the entities on HA dashboard. I have got the value using Node-red but when I wrote it in configuration yaml file as shown in picture attached, I can’t get the value shows on my dashboard, it has always been displaying ‘unknown’.
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If you enter the URL in a browser, what does the received data look like?