Thank you for the feedback and for the linkHi! The TortoiseTable website (https://www.thetortoisetable.org.uk/plant-database/) lists it as safe to eat (search for Mexican Petunia). If it's really Ruellia (I'm bad at plant id)
On photos on TTT mirabilis has wider and shorter leaves. Or there are varietes with long and narrow leaves?looks sort of like 4o'clock (mirabilis jalapa) It was cultivated by the aztecs for medicinal purposes.