@MitSM

I have worked on query, you have posted.Please go through the details below hope it serves the purpose.

Regex I wrote in Jmeter and executed was:

    (?m)"category61B" : \[ "(.*)\"\,\n                    "(.*)\"\, "(.*)\"\,\n                    "(.*)"\, "(.*)" \]\,



1. Also, I have validated the another regex on regex101,which is :

    (?m)"category61B" : \[ "(.*)\"\,\n \s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s"(.*)\"\, "(.*)\"\,\n \s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s"(.*)"\, "(.*)" \]\,

 Please find attached:"Regex_1"

[![Regex_1][1]][1]

2. I have also executed it on Jmeter using jp@gc - Dummy Sampler and response you have provided.Refer post execution result :"Result" and you can utilize individual groups viz. categoryId_g1,categoryId_g2,categoryId_g3 etc. for every value inside the square brackets without ".

[![Result][2]][2]


  [1]: https://i.sstatic.net/e8IBV.png
  [2]: https://i.sstatic.net/WWYZz.png