How to use singleton pattern in React Native

I'm converting an Android application to React Native and I'm new to this react-native technology.

In my android application, I have used the Singleton object to store some data. I just want to create the same for the react-native application. Inside the Java singleton object, it has a list eg : public List<PharmacyLocationChecklistsDTO> pharmacyLocationChecklistsDTOS;.

Scenario: In my java application has wizard this singleton object store all the data of that wizard view. I have already implemented the wizard in my react native application, but I don't know how to store data until the user completes the task.

How could I create this object in my react-native app or is there any other way to handle this scenario?

Response,

"pharmacyLocationChecklistsDTOS": [
            {
                "chelistid": 232,
                "ireqstId": 5,
                "checklistName": "E",
                "validity": "Invalid",
                "remark": null
            }
  ]

Sample Java Object,

public class PharmacyLocationChecklistsDTO{
    public int chelistid;
    public int ireqstId;
    public String checklistName;
    public String validity;
    public Object remark;
}

public class Root{
    public List<PharmacyLocationChecklistsDTO> pharmacyLocationChecklistsDTOS;
}