Finding the length of an element in a tuple

Question

I have the following code:

{% set values = [ ('bank_transfer1', ('credit_card_1', 'complete')),
                  ('bank_transfer2', ('credit_card_2'))]-%}

I want to print the above values in the form of a tuple like below:

bank_transfer1 is ('credit_card_1', 'complete')
bank_transfer2 is ('credit_card_2')

My attempt:

{% for val1, val2 in values%}
   {{ val1 }} is {{ val2}}
{% endfor %}

The output I'm getting is:

bank_transfer1 is ('credit_card_1', 'complete')
bank_transfer2 is credit_card_2

How can I get the output in ('') if there is only one element in a tuple

I tried to print the length of the tuple, but this is giving me the length of the val2 as

2
12

How can I get print the output in the form of ('')