Filebeat hint based autodiscovery - annotation format?

I'm using filebeat with autodiscovery on kubernetes, I'm trying to add a hint as an annotation to my pod to exclude certain lines.

This annotation:

co.elastic.logs/exclude_lines

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

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