Welcome to the forum @joachim_bl
Please select the template node and Export it to the clipboard and paste it in here. Then we will be able to see exactly what you have done. You have not even told us which chart library you are using.
In order to make the flow readable and usable it is necessary to surround it with three backticks (also known as a left quote or backquote ```)
```
code goes here
```
See this post for more details - How to share code or flow json
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