[SalesForce] How to create nested JSON object from custom sObject

I am trying to create some config for front end based on config objects.
I have one custom object where I specify options that I need. Each option is separate custom object of this type. I want to het all the options of some group and make a JSON object to use it at front end to render, disable and so on different parts of UI and buttons.

I have tried something like this:

public static String newSubmissionConfig(){

    NewSubmissionConfig con = new NewSubmissionConfig();
    List<NewSubmissionConfigOption> optList = new List<NewSubmissionConfigOption> ();
    List<FH_List_of_values__C> options = [select Name__c, isActive__c, isRequired__c from options__C where group__c = 'NEW_SUB_CONF'];

    for (options__C opt:options){
        NewSubmissionConfigOption option = new NewSubmissionConfigOption();
        NewSubmissionConfigOptions o = new NewSubmissionConfigOptions();
        option.name = opt.Name__c;
        o.isActive = opt.isActive__c;
        o.isRequired = opt.isRequired__c;
        option.NewSubmissionConfigOptions = o;
        optList.add(option);
    }

    con.newSubmissionConfigOption = optList;


    return JSON.serialize(optList);
}

public class NewSubmissionConfig {
    List<NewSubmissionConfigOption> newSubmissionConfigOption {get;set;}    
}

public class NewSubmissionConfigOption {
    public String name {get;set;}
    public NewSubmissionConfigOptions newSubmissionConfigOptions {get;set;}
}

public class NewSubmissionConfigOptions{        
    public Boolean isActive {get;set;}
    public Boolean isRequired {get;set;}
}

As expected I get object in the following format Array with Arrays inside:

config[
name: option1, newSubmissionConfigOptions [isActive: true, isReuired: true]
name: option2, newSubmissionConfigOptions [isActive: true, isReuired: true]
]

but what I need is just one object:

config: {option1: {isActive: true, isRequired: true},
         option2: {isActive: true, isRequired: true}}

So I can access this config like: config.option1.isActive
Now I'm converting this JSON to proper format in JavaScript, but would be nice to get proper object directly from backend.

option1, option2… is Name__c field from my config custom object.
Is there are any way to create such JSON objects right in APEX code?