How can I define a different dynamic object within Shopify's language fields?

Hi all!

I’m trying to figure out how to replace {{ interval }} with another dynamic object / variable.

I used store_name as an example below to illustrate.

I’ve tried a ton of objects, but continue to receive the dreaded "I18n Error: Missing interpolation value “store_name” for “{{ total_price }} every {{ store_name }}” error.

I would love to replace that text with one of my variant option titles, but can’t figure out how to go about doing this.

Please help!

Note : I’m using the Debut theme and Recharge for subscription purchases.