Change fonts on a document library view SharePoint 2019

IainL-Betasoft Kindly ignore my above response as view formatting is currently supported only in SharePoint Online and not supported in SP 2019.

But, if anyone is trying to do same in future in SP online, view formatting is better option for this.

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IainL-Betasoft Use "view formatting" instead of "column formatting". Using view formatting you can change font color of multiple columns at a time instead of adding same JSON in all columns. It will also help in case new columns will be created in list in future.

You can use simple JSON like below:

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/view-formatting.schema.json",
  "additionalRowClass": "ms-fontColor-black"
}

Documentation: view-list-formatting  

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