No, currently only points, redeemables, currency (depending on your loyalty structure) can manually be gifted from a guest timeline.
If you'd like to manually gift a coupon from a guest timeline reach out to your CSM to submit Prodcut Feedback. Product Feedback will inquire with the Development Team if this feature can be added to the development roadmap.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)