Azure DevOps WebExtension use WebWorker

I want to use a WebWorker inside a WebExtension on an Azure DevOps Server.

Processing data of a large repository cost a lot, so I want to use a WebWorker to calculate in the Background.

But when I call new Worker("static/js/WorkerLoadTree.js"):

//CREATE WORKER
console.log("BEFORE NEW WORKER CALL")
BackgroundWorker = new Worker("static/js/WorkerLoadTree.js");
console.log("AFTER NEW WORKER CALL")

I see in Edge:

and I see in Chrome a bit more details:

VSS.SDK.min.js:2 Rejected XDM promise with no reject callbacks                                                  n._reject @ VSS.SDK.min.js:2
VSS.SDK.min.js:2 DOMException: Failed to construct 'Worker': Script at 'http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/static/js/WorkerLoadTree.js' cannot be accessed from origin 'null'.
    at WorkerStart (http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/static/js/WorkerMain.js:13:32)
    at FillCode (http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/index.html:284:3)
    at http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/index.html:144:6
    at n._wrapCallback (http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/lib/VSS.SDK.min.js:2:951)
    at Array.<anonymous> (http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/lib/VSS.SDK.min.js:2:647)
    at http://136.310.18.216:8070/_apis/public/gallery/publisher/user/extension/SearchRepos/1.0.13/assetbyname/lib/VSS.SDK.min.js:2:1383            n._reject @ VSS.SDK.min.js:2
Failed to load resource: net::ERR_UNEXPECTED                                                            :8070/DefaultCollection/_apis/Contribution/HierarchyQuery/project/09737d31-b39f-49a1-8973-4a702cc4be92:1

It seems to be something wrong to load the WorkerLoadTree.js. Is the way to call correct? How can the worker access a js-file inside an extension?

My Extension File-Structure looks like:

───SearchRepos
    │   icon.png
    │   index.html
    │   SearchRepos-1.0.14.vsix
    │   package-lock.json
    │   package.json
    │   vss-extension.json
    │
    ├───node_modules
    │   └───vss-web-extension-sdk
    │       ...
    │
    └───static
        ├───css
        │       main.css
        │
        ├───js
        │       main.js
        │       WorkerLoadCode.js <- WebWorker
        │       WorkerLoadTree.js <- WebWorker
        │       WorkerMain.js
        │
        ├───lib
        │       jquery-3.4.1.min.js
        │       jstree.js
        │
        └───themes
        ...

Meta:

Azure DevOps Server 17.143.28912.1 (AzureDevOps2019.0.1)

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