For example, I use the command

aws logs tail group_name --profile abc --follow --since 20m --filter-pattern "{ $.level = 50 }" --format json

to tail all messages with level=50. The result looks like this:

2024-12-19T09:22:56.057000+00:00 group_name 
{
    "level": 50,
    "time": 1734600176057,
    "pid": 1,
    "hostname": "...",
    "group": "error",
    "err": {
        "type": "HttpException",
        "message": "Forbidden",
        "stack": "Error: Forbidden\n    at Object.findUserByAuth (/api/src/middleware/utils.js:49:11)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async apiAuth (/api/src/middleware/apiAuth.middleware.js:7:16)",
        "status": 403
    },
    "msg": "Forbidden"
}
2024-12-19T09:33:09.788000+00:00 group_name 
{
    "level": 50,
    "time": 1734600789788,
    "pid": 1,
    "hostname": "...",
    "group": "error",
    "err": {
        "type": "HttpException",
        "message": "Forbidden",
        "stack": "Error: Forbidden\n    at Object.findUserByAuth (/api/src/middleware/utils.js:49:11)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async apiAuth (/api/src/middleware/apiAuth.middleware.js:7:16)",
        "status": 403
    },
    "msg": "Forbidden"
}

All options can be found here: https://awscli.amazonaws.com/v2/documentation/api/latest/reference/logs/tail.html