As of stencil-cli version 3.4.0, any published Widgets on the storefront will appear while rendering the storefront locally with the CLI.

This will allow you to have a more realistic preview of what theme changes will look like in conjunction with any Page Builder content, before you publish your theme.

To update to the latest version of stencil-cli, simply run:

npm i -g @bigcommerce/stencil-cli