How to send data from homegrown systems?

Is it really the case that only pre-cooked firmware can be used and not any other connected self made sensor? I have built a ESP32 / SDS011 / BME280 based unit which is part of my smart home and which I would like to add…

There are systems beside the one on our page that are sending data to our API.
You can find the format of the JSON and the needed header fields at our Github repo wiki

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