The Embed field takes the link of a video, a post or any content WordPress can embed, and previews it right under the field.

Configuration
Go to Modern Fields > Fields groups and add the Embed field. Its settings are in the inspector:
| Effect | |
|---|---|
| Placeholder | The hint shown in the empty field. |
Display the embed
The field stores the link. Read it with get_field() and let WordPress embed it:
With Modern Fields Pro, the Field value block displays the field as a native Embed block, without code.