Try something like
var oControl = new sap.ui.commons.TextView().bindProperty("text", "user/usernme");
oTable.addColumn(new sap.ui.table.Column({label: new sap.ui.commons.Label({text: "User Name"}), template: oControl}));
var oControl = new sap.ui.commons.TextView().bindProperty("text", "user/id");
oTable.addColumn(new sap.ui.table.Column({label: new sap.ui.commons.Label({text: "UserID"}), template: oControl}));
https://sapui5.hana.ondemand.com/sdk/#docs/guide/JSONModel.html