Hi @jenikkrejci,
it is possible to add placeholders for the “Subject” and “Email heading” fields. To see the exact placeholders that are available hover your cursor over the question mark next to the fields.
Currently, placeholders are unavailable for “Additional content” field, but since it would make sense to have them on this field as well, we will include this feature in our next patch.
Since the question is about the additional feature and not any current functionality issue with our plugin, I’m marking this ticket as not a support question. We will update you on this ticket once the patch is available with the placeholders for “Additional content” field!