How to configure public access to Grafana to Scripted dashboards

Thanks in advance!

I have a problem when integrating Grafana with Nagios:

I have Nagios configured against an influxbd database, and Grafana with a datasource against it. I use the Histou tool(Scripted dashboards) for the dynamic generation of graphic templates in grafana, from the data contained in Influxdb.
Everything is correct as long as I have a user registered in Grafana, but I need any Nagios user to be able to use it.

I would like to be able to use some kind of generic token or user that I can invoke by including it in a call via URI, something like this:

https://USER:TOKEN@SERVER/grafana/dashboard/script/histou.js?host=$HOSTNAME$&service=$SERVICEDESC$

or

https://USER:PASS@SERVER/grafana/dashboard/script/histou.js?host=$HOSTNAME$&service=$SERVICEDESC$

how can I do it?

Thanks!