How to enable validation form in Editor widget?

[KirillMalyakin]

Hi!

i have editor widget with one field. How i can validate field before finish (create/edit) polygon and show error message in field?

    editor = new Editor({
      view: mapView,
      layerInfos: [
        {
          layer: areasLayer.getLayer(),
          formTemplate: {
            elements: [
              {
                // @ts-ignore-next-line
                fieldName: "areaId",
                type: "field",
                domain: new CodedValueDomain({
                  codedValues: areasModel
                    .getModel()
                    .map((item) => ({ code: item.id, name: item.name })),
                }),
                label: "Область",
              },
            ],
          },
        },
      ]
    });

i didn't found it information in docs, but guess it's opportunity should exist