Updating custom connector with dynamic values

Hi all, I built a custom connector and prepared it for the initial run and it worked fine on hard-coded data:

[
  {
    "op": "add",
    "path": "/fields/System.Title",
    "value": "5675: ProcessName"
  },
  {
    "op": "add",
    "path": "/fields/System.State",
    "value": "New"
  },
  {
    "op": "add",
    "path": "/fields/System.AreaPath",
    "value": "XYZ Board"
  },
  {
    "op": "add",
    "path": "/fields/System.IterationPath",
    "value": "XYZ Board\\Sprint 24-12"
  },
  {
    "op": "add",
    "path": "/fields/Custom.ProcessID",
    "value": "263"
  },
  {
    "op": "add",
    "path": "/fields/System.Description",
    "value": "A detailed description for the RPA Project."
  },
  {
    "op": "add",
    "path": "/fields/Custom.TypeofAutomation",
    "value": "Unattended"
  }
]

Now I have changed it to:

[
  {
    "op": "add",
    "path": "/fields/System.Title",
    "value": "{{Title}}"
  },
  {
    "op": "add",
    "path": "/fields/System.Description",
    "value": "{{Description}}"
  },
  {
    "op": "add",
    "path": "/fields/System.AreaPath",
    "value": "{{AreaPath}}"
  },
  {
    "op": "add",
    "path": "/fields/Custom.ProcessName",
    "value": "{{ProcessName}}"
  },
  {
    "op": "add",
    "path": "/fields/Custom.ProcessID",
    "value": "{{ProcessID}}"
  },
  {
    "op": "add",
    "path": "/fields/Custom.TypeofAutomation",
    "value": "{{TypeOfAutomation}}"

Is passing data as Request Fileds correct, and how can I link these values with the activity designer?

@Mikolaj_Zielinski

ideally you dont need to variablize here…in custom connector activity builder wharver key fields you select for those the value will be variablized

cheers