I finally understood how it may be presented by means of default schema thanks to :)
...
"id": ["sex", "route", "var", "statistics"],
...
"statistics": {
"category": {
"index": ["N", "mean", "sd"],
"label": {
"N": "total number", "mean": "arithmetic mean", "sd": "standard deviation"
},
"unit": {
"N": {
"decimals": 0
},
"mean": {
"decimals": 2
},
"sd": {
"decimals": 2
}
}
}
}
and "value" as an array.
I.e. wide-formatted table where
N, NMiss, ... , Variance are columns need to be converted to long-formatted table where these columns will be presented as values of the new column/dimension, let say "statistics". And all values will be in the "value"/measure array.