Class ChatMessage

const card = CardService.newCardBuilder()
    .setHeader(CardService.newCardHeader().setTitle("Card Title"))
    .addSection(CardService.newCardSection()
      .addWidget(CardService.newTextParagraph().setText("Text paragraph")))
    .build();

const cardWithId = CardService.newCardWithId().setCardId("card_one").setCard(card);

const message = AddOnsResponseService.newChatMessage().addCardWithId(cardWithId);

const message = AddOnsResponseService.newChatMessage().setText("Example text");