Problem when trying to update pull request description in Github

[JariKuusisto]

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I am facing the following issue when trying to update pull request description in github. We are using pull request template for the description and I am trying to add JIRA ticket id to the description. All goes well until I try to upload it back to the Github by using following command:

curl -v --trace-ascii -L -X PATCH -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }} " -H "X-GitHub-Api-Version: 2022-11-28" https://api.github.com/repos/${repo_name}/pulls/4210 -d "{"body":"${BODY}"}"

Variable BODY contains:

"# PR Description\r\n\r\n> ToDo (PR author): replace this line with a description that helps reviewers in reviewing your PR\r\n\r\n## Checklists\r\n\r\n- [ ] PR author: changelog is up to date ([How to write a changelog entry?]) [ ] PR author: this PR is linked to the correct AOSP ticket\r\n\r\n## Further checks\r\n\r\nHint: For Pull Request Reviews of the following artifacts, use the linked review checklists.\r\nSee special (https://github.com/PROJECT/aos/blob/develop/CONTRIBUTING.md#safety--security) for Security and Safety relevant artifacts.\r\n\r\n- SW Requirements\r\n-](https://github.com/PROJECT/aos/blob/develop/CONTRIBUTING.md#swe1-software-requirement-analysis)%5Cr%5Cn-) SW Architecture\r\n-](https://github.com/PROJECT/aos/blob/develop/CONTRIBUTING.md#swe2-software-architectural-design)%5Cr%5Cn-) SW Detailed Design\r\n-](https://github.com/PROJECT/aos/blob/develop/CONTRIBUTING.md#sw-detailed-design-review-criteria)%5Cr%5Cn-) Code\r\n-](https://github.com/PROJECT/aos/blob/develop/CONTRIBUTING.md#swe4-code-review)%5Cr%5Cn-) SW Unit verification, Integration & Qualification Tests\r\n](https://github.com/PROJECT/aos/blob/develop/CONTRIBUTING.md#test-specifications-unit-integration--qualification-test)%5Cr%5Cn)

I am getting following error:
"message": "Problems parsing JSON"

What I am doing wrong here?