Adding empty row

I want to add an empty row after every 4 rows in the output. Please provide the best possible to achieve this.

Output

Accepted answers

Here's my version

A more elegant solution escapes me at the moment, but you could try this......

Thanks for the solution. However, it is not working, if the input file has multiple fields

@arkimp Can you provide a sample input file with mocked data?

Here's my version

Any Solution of adding 3 Rows at only the start for the output?