Service desk management - Add organization to project via Rest Api

I’m trying to add organizations to projects using rest .
it works with python script but when i try to include the functionality in my developed application it doesn’t work. I don’t get any errors and the app doesn’t crash, but the organization doesn’t get added. I can create a new organization, but I cannot add an existing organization to the project.
Also the answer is presented as [Promise], I was not able to get a more informative answer.
My code is:

async function addOrganizationToProject(orgId,projId) {
    const bodyData = `{
  "organizationId": ${orgId}

const response=""
const data=""

fetch( response = await api
    .requestJira(route`/rest/servicedeskapi/servicedesk/`+projId+`/organization`, {
 method: "POST",
      headers: {
        "Accept": "application/json",
         "Content-Type": "application/json",
         "X-ExperimentalApi": "true",
       body: bodyData
    .then(data => response.json())
    .then (data => {console.log(data)
     return data

Where i’m wrong?
Thanks in advance