The ACF Text widget detects the following Advanced Custom Fields fields:
Examples of ACF fields
You find it easiest by searching for ACF Text in the Elementor Search Widget field:
Drag the following widget icon into your section to add the widget.
After adding the widget to your section/column the following settings are shown.
The fields you can choose from are found in the dropdown next to the setting “Field”. The first detected text field is chosen automatically.