Chrome
In the Network panel, right click on the column headers > Response Headers > Manage Header Columns.
In the Manage Header Columns popup window, click "Add Custom Header". Enter the custom header name, and click Add to add a new column to the Network requests table
Edge
In the Network panel, right click on the column headers > Response Headers > Manage Header Columns.
In the Manage Header Columns popup window, click "Add Custom Header". Enter the custom header name, and click Add to add a new column to the Network requests table.