How to share dynamically created hostPort of the pod as environment variable to the same pod in k8s - kubernetes

Question

apiVersion : apps/v1
kind: StatefulSet
metadata:
name: kafka
labels:
app: kafka
namespace: kafka
spec:
replicas: 3
selector:
matchLabels:
app: kafka
serviceName: kafka
template:
spec:
containers:
- name: kafka
image: debezium/kafka
ports:
- name: kafka-int-port
containerPort: 9092
- name: kafka-ext-port
containerPort: 9093
hostPort: 0
command:
- sh
- -c
args:
- BROKER_ID=${POD_NAME##*-} KAFKA_ADVERTISED_LISTENERS=EXTERNAL://localhost:${HOST_PORT},INTERNAL://${POD_NAME}:9092 /docker-entrypoint.sh start
# - /bin/start.sh
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: HOST_PORT
valueFrom:
fieldRef:
fieldPath: status.hostIP
resourceFieldRef:
containerName: kafka
resource: ports
name: "kafka-ext-port"
fieldPath: [?(#.name=="kafka-ext-port")].hostPort
- name: "ZOOKEEPER_CONNECT"
value: zookeeper-service.kafka.svc.cluster.local
- name: "KAFKA_LISTENERS"
value: "EXTERNAL://:9093,INTERNAL://:9092"
- name: KAFKA_INTER_BROKER_LISTENER_NAME
value: "INTERNAL"
- name: KAFKA_LISTENER_SECURITY_PROTOCOL_MAP
value: "INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT"
metadata:
name: kafka
labels:
app: kafka
I am creating a StatefulSet that runs three replicas of the Debezium Kafka image, each with two ports exposed: kafka-int-port and kafka-ext-port. The kafka-ext-port port is being exposed to the host using hostPort and its value will be dynamically generated.
Each replica is also being passed the BROKER_ID, KAFKA_ADVERTISED_LISTENERS, and other environment variables. The BROKER_ID is being set based on the index of the replica, and KAFKA_ADVERTISED_LISTENERS is being set to EXTERNAL://localhost:${HOST_PORT},INTERNAL://${POD_NAME}:9092.
The HOST_PORT environment variable is being set based on the hostIP status of the pod, and the dynamically generated hostPort value for kafka-ext-port is being extracted from the ports field of the kafka container.
Which has a problem. Can someone please help me to extract hostPort value ?