With |length you can calculate the length of any list or text string.

• automation
• output

• start:
    return:
      list_len@int: {{[1,2,3,4,5,6,7,8,9,10]|length}}
      text_len@int: {{'This is some text'|length}}

• __return:
    list_len: 10
    text_len: 17