Load graph from URL

[nicola-durante-eng]

Hello esnet dev team,

I've installed your plugin in Grafana using these parameters:

- "GF_PLUGINS_ALLOW_LOADING_UNSIGNED_PLUGINS=esnet-networkmap-panel"
- "GF_INSTALL_PLUGINS=https://github.com/esnet/grafana-esnet-networkmap-panel/releases/download/v2.0.1/esnet-networkmap-panel-2.0.1.zip;esnet-networkmap-panel"

The option "Fetch Layer X JSON from URL" seems to be broken.
The same JSON content that works when copying and pasting it in the "Layer X Map data (json) - JSON with edges and nodes of network map" , doesn't work when fetched for a url, i.e. http://host.docker.internal:8000/graph.
I can access the same URL from the datasource section.

I have tried both returning a JSON object and a JSON string (i.e. json.dumps(graph)).

Is the feature not working or am I missing something?