Calling mark at end of scalar of interest produces something like:
{"line1"=>{"value"=>"line2", "line"=>4},
"line4"=>{"value"=>"line5\nline6\n", "line"=>7}}
Calling mark at end of previous scalar produces something like:
{"line1"=>{"value"=>"line2", "line"=>1},
"line4"=>{"value"=>"line5\nline6\n", "line"=>4}}