headers for filters> headers {flags} 
| input | output | 
|---|---|
| list<any> | table | 
| table | table | 
Sets the column names for a table created by split column
>"a b c|1 2 3"|split row"|"|split column" "|headers
╭───┬───┬───┬───╮
│# │ a │ b │ c │
├───┼───┼───┼───┤
│0│1│2│3│
╰───┴───┴───┴───╯
Columns which don't have data in their first row are removed
>"a b c|1 2 3|1 2 3 4"|split row"|"|split column" "|headers
╭───┬───┬───┬───╮
│# │ a │ b │ c │
├───┼───┼───┼───┤
│0│1│2│3│
│1│1│2│3│
╰───┴───┴───┴───╯
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    https://www.nushell.sh/commands/docs/headers.html