Insert "No" header text Cross Object

I can use cross object and add Number of data like :
Col1 Col2
1 xxxx xxxx
2 xxxx xxxx
3 xxxx xxxx
4 xxxx xxxx

how can i add text "No" Header so :

No Col1 Col2
1 xxxx xxxx
2 xxxx xxxx
3 xxxx xxxx
4 xxxx xxxx

Thanks
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