There are 840+ Google Fonts (which are free) and every Typekit font in your Typekit account can be used in Jupiter X. Please note that Elementor has another Typography settings which are all presented here.
Adding a Font
1. From the left menu in your WordPress dashboard, go to Appearance > Customize.
2. From the Customizer left dashboard, go to Fonts & Typography.
3. In the Fonts popup, click on Add a Font Family.
4. Select your font families and close the popup.
Note: After adding the font families, make sure to Publish the changes and Refresh the page.
Note: How to assign a font to an element, you can find in this article.
Then under My Adobe Fonts, copy the project ID:
Paste it in Jupiter X > Control Panel > Settings > Adobe Fonts Project ID.
Note: You need Publish the changes and then refresh the page to make selected Adobe Fonts available in Font & Typography settings.