Are there any conventions or is there any particularly good choice regarding the separator of a list as a single value/cell in a .tsv file e.g. using ,
:
Column_A Column_B Column_C
Value_1 Value_2 Value3.1, Value3.2, Value3.3
CSV/TSV is intended to be used for two-dimensional, tabular data. Therefore, I would suggest a different approach:
Column_A Column_B Column_C
Value_1 Value_2 Value3.1
Value_1 Value_2 Value3.2
Value_1 Value_2 Value3.3
Alternatively, use a more flexible format like JSON.
{"A": "Value_1", "B": "Value_2", "C": ["Value 3.1", "Value 3.2", "Value 3.3"]}