How do I pass array in POST parameter using retrofit ?

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Android

This is the Json format I want to post using Retrofit.

{
  "userTreatmentId": "string",
  "informedConsentId": "string",
  "other": [
    {
      "gdprOptionId": "string",
      "value": true,
      "required": true
    }
  ]
}

This is the interface:

@POST("/api/requestSign")
    Call<RequestSignResponse> requestSign(@Body SignRequest signRequest, @Path("patientGUID") String cardNumber);

This is a Sign Request model class.

public class SignRequest {

    @SerializedName("userTreatmentId")
    @Expose
    private String userTreatmentId;

    @SerializedName("informedConsentId")
    @Expose
    private String informedConsentId;

    @SerializedName("other")
    @Expose
    private Other[] other = null;

    public String getUserTreatmentId() {
        return userTreatmentId;
    }
    public void setUserTreatmentId(String userTreatmentId) {
        this.userTreatmentId = userTreatmentId;
    }

    public String getInformedConsentId() {
        return informedConsentId;
    }
    public void setInformedConsentId(String informedConsentId) {
        this.informedConsentId = informedConsentId;
    }

    public Other[] getOther() {
        return other;
    }
    public void setOther(Other[] other) {
        this.other = other;
    }

}

This is the Other array model class for Sign Request

public class Other {

    @SerializedName("gdprOptionId")
    @Expose
    private String gdprOptionId;

    @SerializedName("value")
    @Expose
    private Boolean value;

    @SerializedName("required")
    @Expose
    private Boolean required;

    public String getGdprOptionId() {
        return gdprOptionId;
    }
    public void setGdprOptionId(String gdprOptionId) {
        this.gdprOptionId = gdprOptionId;
    }

    public Boolean getValue() {
        return value;
    }
    public void setValue(Boolean value) {
        this.value = value;
    }

    public Boolean getRequired() {
        return required;
    }
    public void setRequired(Boolean required) {
        this.required = required;
    }

}

What I have tried:

private void processData() {

        SignRequest signRequest = new SignRequest();

        signRequest.setInformedConsentId(informedConsentId);
        signRequest.setUserTreatmentId(null);
        signRequest.setOther(arrayList2);

        ApiHelper.getService().requestSign(signRequest, PreferencesHelper.getPrefCardNumber(this))
                .enqueue(new Callback<RequestSignResponse>() {
            @Override
            public void onResponse(Call<RequestSignResponse> call, Response<RequestSignResponse> response) {
                Toast.makeText(ConsentDetailActivity.this, response.toString(), Toast.LENGTH_LONG).show();
            }

            @Override
            public void onFailure(Call<RequestSignResponse> call, Throwable t) {
                Toast.makeText(ConsentDetailActivity.this, t.toString(), Toast.LENGTH_LONG).show();
            }
        });
    }