public static void AddDataSources(
    XtraReport report,
    params IComponent[] dataSources
)

Public Shared Sub AddDataSources(
    report As XtraReport,
    ParamArray dataSources As IComponent()
)

using DevExpress.DataAccess.Json;
using DevExpress.XtraReports;
//...

var report = new XtraReport1();

var jsonDataSource1 = new JsonDataSource { /* ... */ };
var jsonDataSource2 = new JsonDataSource { /* ... */ };

DataSourceManager.AddDataSources(report, jsonDataSource1, jsonDataSource2);

Imports DevExpress.DataAccess.Json
Imports DevExpress.XtraReports
'...

Private report = New XtraReport1()

Private jsonDataSource1 = New JsonDataSource()
Private jsonDataSource2 = New JsonDataSource()

DataSourceManager.AddDataSources(report, jsonDataSource1, jsonDataSource2)