very simple nodejs script that conver sql \G result in cli to tsv format:
run node convert_vertical_sql_to_tsv.js sql_result.txt sql_result.tsv
mysql> select * from sbtest1 limit 1\G;
*************************** 1. row ***************************
id: 1
k: 4
c: 8
pad: 6
1 row in set (0.00 sec)
to
"id" "k" "c" "pad"
"1" "4" "8" "6"