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What happened when you tried it?

It doesn't store anything. The NR==1 section of the code replaces the header for the specified fields on the 1st input line it reads. Then, the condition 1 with...

The sample input you provided is not tab delimited. If your real input is tab delimited and you just want to set the headers for certain fields, the easy way would be something like:
awk '
BEGIN...