The issue likely lies in how the plugin is being linked and registered within Superset's frontend. The plugin looks correctly installed and added it to MainPreset.js, however, some updates may be required:

• The key should be ville, not ext-hello-world.
• Remove the sudo when performing "npm ci" and "npm i".
• Ensure that both the plugin (/tmp/superset-plugin-chart-ville) and Superset's frontend (superset-frontend) are using compatible Node.js versions (check engines in package.json).
• Change the new SupersetPluginChartVille().configure({ key: 'ext-hello-world', }), to new SupersetPluginChartVille().configure({ key: 'ville', }), in the MainPreset.js file.

After verifying these, rebuild both the plugin (npm run build in the plugin directory) and the Superset frontend (restart or rebuild as necessary, npm run build is recommanded in the frontend) to ensure changes are fully incorporated, and clear the browser cache or try an incognito window.