How to draw linear chart of a number received 'periodically'?


I am receiving this data from a Shelly H&T plus via an RPC update (filterd to keep only method="NotifyFullStatus")

so I would like to create a chart of the value 

this is always numeric

Could you help me filling this form?

It's from @flowfuse/node-red-dashboard v1.11.1

Actually, I have no idea of what/how fill in the x property

In a change node prior to the chart node,
msg. payload
To the value of
Also set a topic
msg. topic
To the value of
A/z (string) HT Temp
Or any string name you wish for line series, and legend name.

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