Enable Nextcloud app from self host app store without code signing

Thank you for everything.

I would like to download my self-developed app on Nextcloud from a self-hosted server.
In the documentation, it says that code signing is optional. It seems to say that there is an option to do it without a signature from a self-hosted server, but how do I set this up?

https://docs.nextcloud.com/server/latest/developer_manual/app_publishing_maintenance/code_signing.html
I tried removing the items related to code signing from app.json and it is not working properly.
Please help me.

apps.json

[								
    {
      "id": "example-app",
      "categories": [
        "example"
      ],
      "userDocs": "",	
      "adminDocs": "",
      "developerDocs": "",
      "issueTracker": "",	
      "website": "",
      "created": "2016-10-01T09:16:47.111889Z",	
      "lastModified": "2020-12-03T17:51:53.508907Z",
      "releases": [
        {
          "version": "19.0.0",
          "phpExtensions": [],
          "databases": [],
          "shellCommands": [],
          "phpVersionSpec": "*",
          "platformVersionSpec": ">=19.0.0 <20.0.0",	
          "minIntSize": 32,
          "download": "https://<YOUR SELFHOST APPSTORE SERVER>/example_app-19.0.0.tar.gz",
          "created": "2019-12-20T10:57:02.538582Z",	
          "licenses": [	
            "agpl"
          ],
          "lastModified": "2020-12-03T19:50:16.104357Z",
          "isNightly": false,
          "rawPhpVersionSpec": "*",
          "rawPlatformVersionSpec": ">=19 <=20",
          "translations": {}
        }
      ],
      "screenshots": [
        {
          "url": "",	
          "smallThumbnail": ""
        }	
      ],
      "translations": {	
        "en": {	
          "name": "example",
          "summary": "example app",	
          "description": "example app"
        }					
      },								
      "isFeatured": false,
      "authors": [
        {
          "name": "",	
          "mail": "",	
          "homepage": ""
        }
      ],
      "ratingRecent": 0.5,
      "ratingOverall": 0.980769230769231,	
      "ratingNumRecent": 0,
      "ratingNumOverall": 26,
      "discussion": ""
    }								
  ]