New plugin architecture: How to build?

Elastic Stack Kibana
6
  1. I need plugin for 7.9.1
  2. Yes, I use plugin-generator
  3. I must use some dependency. Plugin-generator don't create package.json. So I had to create it manually. It looks like this
{
  "name": "my_plugin",
  "version": "1.0.0",
  "kibana": {
    "version": "7.9.1",
    "templateVersion": "1.0.0"
  },
  "license": "Apache-2.0",
  "scripts": {
    "kbn": "node ../../scripts/kbn.js",
    "build": "plugin-helpers build",
    "start": "node ../../scripts/kibana --dev",
    "lint:es": "node ../../scripts/eslint",
    "lint:sass": "node ../../scripts/sasslint",
    "lint": "yarn run lint:es && yarn run lint:sass"
  },
  "devDependencies": {
    "@kbn/plugin-helpers": "link:../../packages/kbn-plugin-helpers"
  },
  "dependencies": {
    "@hapi/joi": "^17.1.1",
    "@types/hapi__joi": "^17.1.6",
    "pg": "^8.4.2",
    "typescript": "^4.0.5"
  }
}

file .kibana-plugin-helpers.json look like this

{
  "buildSourcePatterns": [
    "package.json",
    "yarn.lock",
    "tsconfig.json",
    "{public,server}/**/*",
    "kibana.json"
  ]
}

kibana.json as created by plugin-generator

{
  "id": "myPlugin",
  "version": "7.9.1",
  "server": true,
  "ui": true,
  "requiredPlugins": ["navigation"],
  "optionalPlugins": []
}

Now yarn build create plugin zip and I can install plugin. Kibana starts with plugin. I see it in the list on the console (cli) when kibana starts. Now no errors. But kibana don't work, I see red banner when connect to http.
With yarn start --oss everything work fine.
Maybe someone has an example of how to build a plugin with dependencies