In Integromat, you define each layer of data separately in the Modifications section.
Modifications are simply a list of changes you want to make to the template. To change a layer in a template, you need to reference it by its name.
You can see all template layer names either in the Bannerbear API Console on your project page, or in the Template Editor.
Once you've got that, you can add the desired modifications as in the example below.
For more helpful information, consider checking our Integromat blog articles ↗.