Regex Output format

I have a Regex to parse all titles in my data
This works fine, but it list all titles under each other.
Can I somehow collect all in a comma separate string?

Title1, Title2, title3,

BLOCK:Parse
  input = @data.SOURCE
  caseSensitive = False
  pattern = $"\"title\":\"([^\"]*)\""
  outputFormat = "[1]"
  RECURSIVE
  MODE:Regex
  => CAP @Title
ENDBLOCK

Solved it

BLOCK:Parse
LABEL:Parse Channel Groups
  input = @data.SOURCE
  caseSensitive = False
  pattern = $"\"title\":\"([^\"]*)\""
  outputFormat = "[1]"
  RECURSIVE
  MODE:Regex
  => VAR @List1
ENDBLOCK

string title = string.Join(", ", List1);

BLOCK:Parse
LABEL:Channel Groups
  input = $"<title>"
  prefix = "Channel Groups: "
  MODE:LR
  => CAP @parseOutput
ENDBLOCK