Regex for finding commas in a field of a JSON

I want to create a regex that will help me find the commas that between the strings "RecruiterEmails" and "SourcerEmails" and that are between double quotes. The regex will find the comma and I will use the replace strategy to replace it with \n

This JSON as input

[
  {
    "JobRefId": "Ref1",
    "RecruiterEmails": "john@gmail.com,carl@gmail.com,mario@gmail.com",
    "SourcerEmails": "robert@gmail.com,jim@gmail.com",
    "JobStatus": "On,Now"
  }
]

Should have this output after replacing the selected commas in RecruiterEmails with \n

[
  {
    "JobRefId": "Ref1",
    "RecruiterEmails": "john@gmail.com\ncarl@gmail.com\nmario@gmail.com",
    "SourcerEmails": "robert@gmail.com,jim@gmail.com",
    "JobStatus": "On,Now"
  }
]

Please note that I do NOT want the comma that is end of the line (the one that separates the fields RecruiterEmails and SourcerEmails) and that I do NOT want the commas that separate the emails of SourcerEmails. All I want are the commas that separate the emails of RecruiterEmails.

The regex I have been able to draft so far captures all the characters in between RecruiterEmails and SourcerEmails, but I want only the specified commas.

This is the regex:

"RecruiterEmails"([\S\s]*?)"SourcerEmails"

I know that this can be done through a JOLT transformation, but the software I am using does not support JOLT transformations. The only possible way is to do it through a regex.

Thank you in advance!

You can use look ahead to assert that you are on the line that precedes "SourcerEmails" with this regex:

,(?=.*",\s+"SourcerEmails")