HTTP ingress type Apache Flink StateFun

I am trying to quickly put together a proof of concept using the Apache Flink statefun Docker image.

https://hub.docker.com/r/apache/flink-statefun

I don't really want to use Kafka or Kinesis as an ingress, I'd rather just use HTTP so I can quickly test and prototype. Is this possible?

The only ingress examples I can find are for Kafka like:

kind: io.statefun.kafka.v1/ingress
spec:
  id: com.ingress/Sentiment
  address: kafka-broker:9092
  consumerGroupId: sentiment-reader
  topics:
    - topic: sentimentegress
      valueType: SentimentEvent
      targets:
        - sentiment

AFAIK, there's no HTTP ingress. You could probably put one together fairly easily using the Kafka Connect HTTP connector, but that would obviously involve setting up Kafka and Kafka Connect.