I have a calculated field based on other multiple columns. I want to show the value of it in Header part. When I am using the same in JSON, it says "Can not read property value of Null". However I do not have any null value in the status column.

  • It's hard to tell what you're doing without seeing the JSON itself. One thing to keep in mind, however, is that list formatting requires the fields you want to reference to be part of the view (unlike calculated columns). So if you are referencing a column ([$SomeField]) and it isn't part of the view, the value will be null. Commented Mar 12, 2021 at 16:52

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Per my knowledge, you cannot customize list header with JSON formatting. All we can do is to hide column header.

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