Graphing of Fiber Optic signal

Dear All,
I am using Grafana with collected to check my BW and interfaces status on juniper switches and routers, and it is working perfectly;
There is a command returning the “Receiver signal average optical power” and the returned value looks like: -3.27 etc…
how can i get this value and let grafana draw the related graph of these values?
the command in Juniper is: show interfaces diagnostics optics xe-0/0/0
Thank you,
Roger