How to write Json null value as an empty line in new file (converting json based log into column format, i.e., one file per column)

Question

example of log file:

{"timestamp": "2022-01-14T00:12:21.000", "Field1": 10, "Field_Doc": {"f1": 0}}
{"timestamp": "2022-01-18T00:15:51.000", "Field_Doc": {"f1": 0, "f2": 1.7, "f3": 2}}

It will generate 5 files:

1.timestamp.column

2.Field1.column

3.Field_Doc.f1.column

4.Field_Doc.f2.column

5.Field_Doc.f3.column

Example content of timestamp.column:

2022-01-14T00:12:21.000
2022-01-18T00:15:51.000

I'm facing a problem while the values of keys are null, undefined as when the value us is null for example:

{"timestamp": "2022-01-14T00:12:21.000", "Field1": null, "Field_Doc": {"f1": undefined}}

can someone help me out here?