public ImageResponseCard withSubtitle(String subtitle) {
        setSubtitle(subtitle);
        return this;
    }
<p>
The subtitle to display on the response card. The format of the subtitle is determined by the platform displaying
the response card.
</p>

@param subtitle
       The subtitle to display on the response card. The format of the subtitle is determined by the platform
       displaying the response card.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lexruntimev2/src/main/java/com/amazonaws/services/lexruntimev2/model/ImageResponseCard.java