Why does the JSON script not work?

Question

I am looking to use a JSON script to set a column equal to a calculated JSON script. However, the column itself is blank so I tried using a simpler JSON script. I formatted the distance column with the following JSON script. Both distance and TempInfo are text data types. What am I doing wrong?

{  
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",  
  "elmType": "div",  
  "txtContent": "=[$TempInfo]"   
}

Column with JSON Script:

TempInfo Column:

Result:

Answer 1

Select distance column -> Column settings -> Format this column -> Advanced mode -> Add following codes.

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "=[$TempInfo]"
}

You should use [$ColumnName] to reference another column, the ColumnName need to be the internal name instead of the display name. To check the internal name of the column, you could check it in the URL.

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