Fluentbit + Firelens unable to parse and ship log JSON fields as labels (AWS ECS Fargate)

Question

My stack is on AWS Fargate. Application, grafana, loki on the same ECS cluster. My application generates logs,

Log Stream sample below:

{"host":"ip-00-3001-1a08-test.us-west-1.compute.internal","short_message":"Sent message: {\"test\":{\"test\":\"31901300\",\"}}","full_message":"Sent message: {\"test\":{\"test\":\"31901300\"}}","timestamp":1.707740449767E9,"level":6,"facility":"logstash-abctest","simpleLogger":"test-abc","logSequence":9696969696,"activity":"00000000222255544","logLevel":"INFO","logger":"test","senderType":"test","terminalID":"test300"}

Find my logConfiguration in ECS Task_definitation:

"logConfiguration": {
                "logDriver": "awsfirelens",
                "options": {
                    "LabelKeys": "container_name,ecs_task_definition,source,ecs_cluster",
                    "Labels": "{job=\"firelens\"}",
                    "LineFormat": "json",
                    "Name": "grafana-loki",
                    "RemoveKeys": "container_id,ecs_task_arn",
                    "Url": "http://loki.endpoint:3100/loki/api/v1/push"
                }

There are some fields in my Log stream such as host, short_message, full_message, timestamp, level, facility, logSequence, activity, logLevel, logger, sendType, terminalID etc.

My goal is to parse these fields as Labels in Loki data source. Suggest necessary configuration to make in AWS ECS Task Definitation to accomplish it.

FYI, Currently, I am only able see meta data of cluster (container_name, ecs_cluster, ecs_task_definition, job, source) as Lebels.

Thanks in advance.

I tried to add fields of log stream in logConfiguration of the task definitation like this:

"LabelKeys": "senderType,activity,full_message,short_message,container_name,ecs_task_definition,source,ecs_cluster",
"Labels": "{job=\"firelens\",senderType=\"${senderType}\",activity=\"${activity}\"}",

But that didn't work.