Documentation is lacking, how annotation should be used?

Hi, I'm reading the hint based autodiscovery and there should be an example for EVERY annotation, not for some.

This annotation:

co.elastic.logs/exclude_lines

is documented as a list of regular expressions, what is the format?
This annotation:

metadata:
  annotations:
    co.elastic.logs/exclude_lines: '["regex1","regex2"]'
    # or
    co.elastic.logs/exclude_lines: 'regex1|regex2'

Often I found it frustrating administering elastic products because of poor documentations.
Thanks.