Opt in conditional

Hi.

Is there any way to use this as an optional opt in on a regular contact form? Like “Check Here if you’d like to be on our mailing list” or is the only way to interface with Robly through this plugin is to push data to your lists? You know what I mean?

Like I have a regular contact form, but a checkbox that says, “yeah add me to your mailing list also”

Thanks.