Hierarchical structure

Hi ,
I wanted to create a hierarchy using this plugin, Right now what i saw, is it groups the rules together ,but they are not in any hierarchical structure.
Can i customize this plugin, if so how?

{
"condition": "AND",
"rules": [
{
"id": "price",
"field": "price",
"type": "double",
"input": "number",
"operator": "less",
"value": 10.25
},
{
"condition": "OR",
"rules": [
{
"id": "category",
"field": "category",
"type": "integer",
"input": "select",
"operator": "equal",
"value": 2
},
{
"id": "price",
"field": "price",
"type": "double",
"input": "number",
"operator": "equal",
"value": 1
}
]
},
{
"id": "name",
"field": "name",
"type": "string",
"input": "text",
"operator": "equal",
"value": "Test"
}
],
"valid": true
}

SO as per this eg:

price, group(category & price) and name they all are in same level, but what if i want to define that group(category & price) inside the price(1st block) so that when i do get rules, i should get something like this.

Please help.

This is what i am expecting to create a json:
{
"condition": "AND",
"rules": [
{
"id": "price",
"field": "price",
"type": "double",
"input": "number",
"operator": "less",
"value": 10.25,
"rules": [
{
"condition": "OR",
"rules": [
{
"id": "category",
"field": "category",
"type": "integer",
"input": "select",
"operator": "equal",
"value": 2
},
{
"id": "price",
"field": "price",
"type": "double",
"input": "number",
"operator": "equal",
"value": 1
}
]
}
]
},
{
"id": "name",
"field": "name",
"type": "string",
"input": "text",
"operator": "equal",
"value": "Test",
"rules": []
}
],
"valid": true
}

No files or tests are named; start by tracing the plugin's current rule/group model and the get rules serialization path. Confirm the intended nesting semantics and existing UI/API constraints; done means a tested way to produce the requested nested JSON without flattening sibling rules.