how to set Example in 3.0.0?

[Sim Tsai (SimTsai)]

OpenApiSchema.Example type from OpenApiString to JsonNode.
how can I set example?

before

options.MapType<DateOnly>(() => new OpenApiSchema
{
    Type = "string",
    Format = "date",
    Example = new OpenApiString($"{DateTimeConstants.MinDate:yyyy/MM/dd}")
});

now

options.MapType<DateOnly>(() => new OpenApiSchema
{
    Type = JsonSchemaType.String,
    Format = "date",
    Example = ???
});