You can do this easily with Raku/Sparrow:

begin:
regexp: ^^ \d\d "/" \d\d "/" \d\d\d\d
generator: <<RAKU
!raku
say '^^ \s+ "', config()<pkg>, '" \s+';
RAKU
end:

code: <<RAKU
!raku
for matched() -> $line {
    say $line
}
RAKU

Then just - s6 —task-run@pkg=openssl.base