Modifiers inside of tags (e.g. glide)?

I'm looking for a way to do a simple math operation on a variable before using it in a tag. Specifically, I'd like to generate a glide image url with a height based on a provided width, when given an aspect ratio. Glide doesn't appear to support an aspect ratio parameter, so I tried using a multiply modifier inside the tag.

I tried a few variations, but thought something like this would work:

{{ glide:image width="{w}" height="{w | multiply:2 }" }}

Doing it the following way output w in the height parameter, but didn't multiply it:

{{ glide:image width="{w}" height={w | multiply:2} }}

so either something is broken or I don't understand what's happening here (more likely).

Anyone have any idea what's going on here? Is the only option to create an addon to manage this calculation?

Answered by Erin Dalzell!
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