You can make truly amazing content layouts for your tab content by using the Elementor templates.
Yes! You can use the Elementor template inside your tabs as content using The Plus Addons for Elementor Tabs/Tours widget.
To check the complete feature overview documentation of The Plus Addons for Elementor Tabs and Tours widget, click here.
Requirement – This widget is a part of The Plus Addons for Elementor, make sure it’s installed & activated to enjoy all its powers.
For this, first, you need to create an Elementor template.
Go to Dashboard > Templates > Saved Templates.
Click on ADD NEW TEMPLATE or IMPORT TEMPLATES to import any existing template design.

Now you can use any Elementor widgets like image, gallery, post list, products, etc., to create your template.
Once done, drag and drop the Tabs/Tours widget on the page and open the tab to which you want to add the template.
Under the Type > Page Template, choose your newly created template from the dropdown.

And create some amazing-looking tabs for your website, just like the demo below.

Also, check How to make vertical tabs in Elementor.