Adding support for templating languages?
**Which version of the plugin are you using?**
[X] Data Populator for Sketch
[ ] Data Populator for Adobe XD

Although it is simple and intuitive to use a flat object in JSON for populating the fields, there are some use cases where it might be helpful to use a templating language like [Liquid](https://github.com/Shopify/liquid). For instance, if we want to use loops and arrays.

Do you have any thoughts on how feasible it would be to add something like this?