Yes there is??? Do you know what a read receipt is?
Again, storing messages on the blockchain is a fucking terrible idea. I don't need to store the dumb memes my friends send to each other eternally on the blockchain, nor does anyone give a shit. If it's important enough to want to be saved, you do this new technique called a damn backup.
I don't want to open myself up to my key getting hacked and my entire life history's messages getting leaked. I don't want to open myself to someone stealing my device where my key is stored and having indefinite access to all my past, present, and future data. I don't want to leave my data publicly available with all the metadata and message sizes to see for any unknown third parry, and to who is being sent what to whom. I don't want to be vulnerable to potential encryption breaking techniques in the future. I don't want to deal with the gas cost, the huge amount of latency that would make real time chat unviable, and the insane amount of overhead to solve an already solved problem with an objectively worse solution in every possible way.
These are problems that don't need to be solved with blockchain. Every problem you're suggesting has been solved decades ago and for absolutely free. You are dense as hell and aren't even attempting to look at the already existing technology that has already solved this. Fuck out of here crypto bro.