Jinja code is not working to fetching ledger balance in print designer

Print Designer
1

Jinja code is not working to fetching ledger balance in print designer
Here is code

{% if doc.party %}
  {% set party_type = doc.party_type %}
  {% set party = doc.party %}
  {% set balance = frappe.db.get_value("GL Entry",
    {"party_type": party_type, "party": party},
    "SUM(debit) - SUM(credit)") %}
  {% if balance is not none %}
    {{ _("Ledger Balance") }}: {{ frappe.format_value(balance, { "fieldtype": "Currency", "precision": 0 }) }}
  {% else %}
    {{ _("No ledger balance available.") }}
  {% endif %}
{% endif %}

As on: {{ frappe.utils.format_datetime(frappe.utils.now_datetime(), "dd-MM-yyyy HH:mm") }}