I am trying to write a DeploymentSpec YAML config file referring to this example:

$ prefect deployment inspect 'hello-world/hello-world-daily'
{
    'id': '710145d4-a5cb-4e58-a887-568e4df9da88',
    'created': '2022-04-25T20:23:42.311269+00:00',
    'updated': '2022-04-25T20:23:42.309339+00:00',
    'name': 'hello-world-daily',
    'flow_id': '80768746-cc02-4d25-a01c-4e4a92797142',
    'flow_data': {
        'encoding': 'blockstorage',
        'blob': '{"data": "\\"f8e7f81f24512625235fe5814f1281ae\\"", "block_id":
"c204821d-a44f-4b9e-aec3-fcf24619d22f"}'
    },
    'schedule': {
        'interval': 86400.0,
        'timezone': None,
        'anchor_date': '2020-01-01T00:00:00+00:00'
    },
    'is_schedule_active': True,
    'parameters': {},
    'tags': ['earth'],
    'flow_runner': {'type': 'universal', 'config': {'env': {}}}
}

Is there any extensive example available to write the complete config for a flow??

this page provides examples of how you can specify it using YAML e.g.

prefect deployment create your_file.yml

name: hello-world-daily
flow_location: ./path/to/flow.py
flow_name: hello-world
tags:
- foo
- bar
parameters:
    name: "Earth"
schedule:
    interval: 3600

Yes it is indeed easy to write with code intellisense