Create a Global Triggers and it will create a Meta box, it takes all the parameter of CMB2, fields are added separately

[aw2.register metabox part=start id=gallery]
	{
			"id"           :"gallery",
			"title"         :"Gallery",
			"object_types"  : [  "as_gallery" ],
			"context"      :"normal",
			"priority"     :"high",
			"show_names"    : true
	}
	[/aw2.register]
	[aw2.register metabox part=field id=gallery]
	{
			"name":"Images",
			"id"   : "gallery_images",
			"type":"file_list"
	}
	[/aw2.register]

Various Fields Type

Here's the built-in fields you can include in your metabox. You can also add your own field types.

1. title An arbitrary title field *
2. text
3. text_small
4. text_medium
5. text_email
6. text_url
7. text_money
8. textarea
9. textarea_small
10. textarea_code
11. text_time Time picker
12. select_timezone Time zone dropdown
13. text_date_timestamp Date Picker (UNIX timestamp)
14. text_datetime_timestamp Text Date/Time Picker Combo (UNIX timestamp)
15. text_datetime_timestamp_timezone Text Date/Time Picker/Time zone Combo (serialized DateTime object)
16. hidden Hidden input type
17. colorpicker Color picker
18. radio *
19. radio_inline *
20. taxonomy_radio *
21. taxonomy_radio_inline *
22. select
23. taxonomy_select *
24. checkbox *
25. multicheck and multicheck_inline
26. taxonomy_multicheck *
27. taxonomy_multicheck_inline
28. wysiwyg (TinyMCE) *
29. file Image/File upload *†
30. file_list Image/File list upload
31. oembed Converts oembed urls (instagram, twitter, youtube, etc. oEmbed in the Codex)
32. group Hybrid field that supports adding other fields as a repeatable group. *

For more details read this article https://github.com/WebDevStudios/CMB2/wiki/Field-Types