templates - Magento: Building a store URL in CMS-syntax, using a variable -

i building e-mail template. want build url this:

http://store.com/path/to/page?shipmentid=123

this code builds correct url:

{{store url='path/to/page' _query_shipmentid=123}}

but 123 part should dynamic. need pull variable:

{{var shipment.id}}

is possible? i'm looking this:

{{store url='path/to/page' _query_shipmentid=shipment.id}}

use $ prefix let magento know variable. code should work:

{{store url='path/to/page' _query_shipmentid=$shipment.getid()}}

shell