Variable template

HI, I ask you for help to do the following:
with a Text panel, developed in html and JS code, through API, I query a server that returns me a list of devices belonging to a particular group of devices. I would like to pass this list to a templates variable to take advantage of the “repeat” option on other dashboard panels.
What I can’t do is just create this template variable

Have you checked the documentation on templated and variables? Here is the link:

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Thanks aparajitachatterjee