awk command with v=line number as variable

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北海茫月
北海茫月 2021-02-09 03:12

i have a file called shazad.txt [root@ans archive]# cat shazad.txt a aa aaa aaaa aaaaa aaaaaa aaaaaaa aaaaaaaa aaaaaaaaa aaaaaaaaaa

i want to add some data at specific li

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