2016b >> json = savejson('',data)
name
name =
  0×0 empty char array
item
item = 
  struct with fields:

    Test: {'GML'  'XML'}
level
level =
     0
vargin
varargin =
  cell
    [1×1 struct]

name
name =
Test
item
item =
  1×2 cell array
    'GML'    'XML'
level
level =
     1
vargin
varargin =
  cell
    [1×1 struct]

name
name =
  0×0 empty char array
item
item =
GML
level
level =
     2
vargin
varargin =
  cell
    [1×1 struct]

txt
txt =
		"GML"


name
name =
  0×0 empty char array
item
item =
XML
level
level =
     2
vargin
varargin =
  cell
    [1×1 struct]

txt
txt =
		"XML"


txt
txt =
	"Test": [
		"GML",
		"XML"
	]


txt
txt =
{
	"Test": [
		"GML",
		"XML"
	]
}


json =
{
	"Test": [
		"GML",
		"XML"
	]
}