Can't set different json values with different values

Linux Mint 20.2

Here report.empty.json

{
  "total": 0,
  "project": "",
  "Severity": [],
  "issues": []
}

I want to set value = 500 (int value) to "total" and "MY_PROJECT".

To do this I use tool "jq"

Here by bash script file:

#!/bin/bash

readonly PROJECT_KEY=MY_PROJECT
readonly PAGE_SIZE=500

jq --arg totalArg "$PAGE_SIZE" '.total = $totalArg' report.empty.json > report.json
jq --arg projectKey "${PROJECT_KEY}" '.project = $projectKey' report.empty.json > report.json

echo "Done"

But it set only key project. The key total is not changed.
Content of file report.json

{
  "total": 0,
  "project": "MY_PROJECT",
  "Severity": [],
  "issues": []
}

But I need to update BOTH KEYS.

The result must be:

{
  "total": 500,
  "project": "MY_PROJECT",
  "Severity": [],
  "issues": []
}

>Solution :

The second command reads from report.empty.json instead of the already-modified report.json.

You could chain the jq

jq --arg totalArg "$PAGE_SIZE" '.total = $totalArg' report.empty.json |
jq --arg projectKey "${PROJECT_KEY}" '.project = $projectKey' >report.json

But a better solution is to use just use one command.

jq --arg totalArg "$PAGE_SIZE" --arg projectKey "$PROJECT_KEY" '
   .total = $totalArg | .project = $projectKey
' report.empty.json >report.json