Django template's "with" statement to calculate values

withconditional.html

{% if photo.ispromo %}
    {% cloudinary photo.original_image_id width=photo.width height=photo.height crop="fill" angle='exif' gravity='faces' border="4px_solid_black" %}
{% else %}
    {% cloudinary photo.original_image_id width=photo.width height=photo.height crop="fill" angle='exif' gravity='faces'  %}
{% endif %}