How to use HAML inside a .vue file in vue 3-rc.3 - vue.js

Question

I am trying to use HAML inside the .vuefile in the vue version 3 but it is not working.
What I did.
Intall vue cli version 3.0.0-rc.3
Created a new project with:
My package is:
{
"name": "project 3",
"version": "0.1.0",
"private": true,
"scripts": {
"serve": "vue-cli-service serve",
"build": "vue-cli-service build",
"lint": "vue-cli-service lint",
"test:unit": "vue-cli-service test:unit"
},
"dependencies": {
"haml": "^0.4.3",
"haml-haml-loader": "^1.0.1",
"hamljs": "^0.6.2",
"register-service-worker": "^1.0.0",
"vue": "^2.5.16",
"vue-router": "^3.0.1",
"vuex": "^3.0.1"
},
"devDependencies": {
"#vue/cli-plugin-babel": "^3.0.0-beta.15",
"#vue/cli-plugin-eslint": "^3.0.0-beta.15",
"#vue/cli-plugin-pwa": "^3.0.0-beta.15",
"#vue/cli-plugin-unit-mocha": "^3.0.0-beta.15",
"#vue/cli-service": "^3.0.0-beta.15",
"#vue/test-utils": "^1.0.0-beta.16",
"chai": "^4.1.2",
"node-sass": "^4.9.0",
"sass-loader": "^7.0.1",
"vue-template-compiler": "^2.5.16"
},
"browserslist": [
"> 1%",
"last 2 versions",
"not ie <= 8"
]
}
In the old vue cli version 2 with pwa template it worked fine, my package.json for the one that works:
{
"name": "project",
"version": "1.0.0",
"description": "A Vue.js project",
"author": "Ruan Carlos <ruanltbg#gmail.com>",
"private": true,
"scripts": {
"dev": "node build/dev-server.js",
"start": "node build/dev-server.js",
"build": "node build/build.js",
"unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
"e2e": "node test/e2e/runner.js",
"test": "npm run unit && npm run e2e",
"lint": "eslint --ext .js,.vue src test/unit/specs test/e2e/specs"
},
"dependencies": {
"haml": "^0.4.3",
"haml-haml-loader": "^1.0.1",
"hamljs": "^0.6.2",
"vue": "^2.5.2",
"vue-router": "^3.0.1"
},
"devDependencies": {
"autoprefixer": "^7.1.5",
"babel-core": "^6.26.0",
"sw-precache-webpack-plugin": "^0.11.4",
"babel-eslint": "^8.0.1",
"babel-loader": "^7.1.2",
"babel-plugin-transform-runtime": "^6.23.0",
"babel-preset-env": "^1.6.0",
"babel-preset-stage-2": "^6.24.1",
"babel-register": "^6.26.0",
"chalk": "^2.1.0",
"connect-history-api-fallback": "^1.4.0",
"copy-webpack-plugin": "^4.1.1",
"css-loader": "^0.28.7",
"cssnano": "^3.10.0",
"eslint": "^4.9.0",
"eslint-friendly-formatter": "^3.0.0",
"eslint-loader": "^1.9.0",
"eslint-plugin-html": "^3.2.2",
"eslint-plugin-import": "^2.7.0",
"eslint-plugin-node": "^5.2.0",
"eslint-config-airbnb-base": "^11.1.3",
"eslint-import-resolver-webpack": "^0.8.1",
"eventsource-polyfill": "^0.9.6",
"express": "^4.16.2",
"extract-text-webpack-plugin": "^3.0.0",
"file-loader": "^1.1.5",
"friendly-errors-webpack-plugin": "^1.6.1",
"html-webpack-plugin": "^2.30.1",
"http-proxy-middleware": "^0.17.4",
"webpack-bundle-analyzer": "^2.9.0",
"cross-env": "^5.0.5",
"karma": "^1.7.1",
"karma-coverage": "^1.1.1",
"karma-mocha": "^1.3.0",
"karma-phantomjs-launcher": "^1.0.4",
"karma-phantomjs-shim": "^1.5.0",
"karma-sinon-chai": "^1.3.2",
"karma-sourcemap-loader": "^0.3.7",
"karma-spec-reporter": "0.0.31",
"karma-webpack": "^2.0.5",
"mocha": "^4.0.1",
"chai": "^4.1.2",
"sinon": "^4.0.1",
"sinon-chai": "^2.14.0",
"inject-loader": "^3.0.1",
"babel-plugin-istanbul": "^4.1.5",
"phantomjs-prebuilt": "^2.1.15",
"chromedriver": "^2.33.1",
"cross-spawn": "^5.1.0",
"nightwatch": "^0.9.16",
"selenium-server": "^3.6.0",
"semver": "^5.4.1",
"shelljs": "^0.7.8",
"opn": "^5.1.0",
"optimize-css-assets-webpack-plugin": "^3.2.0",
"ora": "^1.3.0",
"rimraf": "^2.6.2",
"url-loader": "^0.6.2",
"vue-loader": "^13.3.0",
"vue-style-loader": "^3.0.3",
"vue-template-compiler": "^2.5.2",
"webpack": "^3.7.1",
"webpack-dev-middleware": "^1.12.0",
"webpack-hot-middleware": "^2.19.1",
"webpack-merge": "^4.1.0",
"uglify-es": "^3.1.3"
},
"engines": {
"node": ">= 4.0.0",
"npm": ">= 3.0.0"
},
"browserslist": [
"> 1%",
"last 2 versions",
"not ie <= 8"
]
}
Does anybody has any clue?