email bank account – edits

Hello,
when a customer buys something he receives an email with payment details. You are adding this:

Naše bankovní spojení
CZK (currency code):
Bank: Fio banka a.s.
Bank number: 290278***/2010
IBAN: CZ112010000000****84
BIC: FIOBCZPPXXX

And I want to add a variable symbol to it. How can I do it? I can use a hook like this “add_action( ‘woocommerce_email_before_order_table’, ‘add_variable_symbol_to_email’, 10, 4 );” but you have this info in an <ul></ul> . So it would not be in that.

The same goes for the last page of checkout. You are adding bank details but no variable symbol. How Can I added it there so it has the same style?