1. To auto insert text you copy, use a clipboard inserter extension:
Chrome Firefox and set the element to p and selector to body.

2. You can get a free API key from DeepL. The key and other data are stored locally in the browser.

3. This enables automatically adding translations to new cards created in Anki. Make sure you are running Anki with the AnkiConnect add-on installed, and add https://www.cliperl.com to the webCorsOriginList in AnkiConnect's settings.