since you want each element of the list in a separate/individual list, then you have to iterate through the original list and add an element in a empty list and append that new list to the resultant list.
main_list = ['325', '323', '324', '322']
final_solution = []
for element in main_list:
tmp = [element]
final_solution.append(tmp)
print(final_solution)
# output -> [['325'], ['323'], ['324'], ['322']]`
or, by using list comprehension
final_solution = [[element] for element in main_list]
print(final_solution)
# output -> [['325'], ['323'], ['324'], ['322']]`
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