JQ invocation to expand all JSON strings, and change any "None" value to delete the key.

gistfile1.txt

jq -c 'def try_parse_json: try (fromjson) catch .;                                                                                                 
            def expand_json_strings: walk(if type == "string" then try_parse_json | if type == "string" then . else expand_json_strings end else . end);         
            def remove_none_values: if type == "object" then with_entries(select(.value != "None")) elif type == "array" then map(remove_none_values) else . end$
            expand_json_strings | remove_none_values                                                                                                             
            | .[]'
            
# line 2 - anything that expands with fromjson gets expanded
# line 3 - any key with the value of "None", the key gets deleted.