This plugin Requires the ACF Field A Widget field.
https://github.com/lucasstark/acf-field-a-widget

Creates a Widget Area field type that allows you to configure widgets inside of an ACF Field.

This ACF field type is compatible with:

• ACF 5

1. Copy the acf-widget_area folder into your wp-content/plugins folder
2. Activate the Widget Area plugin via the plugins admin page
3. Create a new field via ACF and select the Widget Area type
4. Please refer to the description for more info regarding the field type settings

Please see readme.txt for changelog