Is there any http header that an http server can use to communicate the maximum request size to an http client?

I have looked all over for this and cannot find an answer so please forgive me if my Google-Fu is just failing me.

I currently working with http servers and I was trying to find a protocol-based or other standards-based way to communicate to a client what the maximum HTTP request size was but it doesn't appear as though such a thing exists.

I was looking for something similar to a Content-Length header. Maybe something like Max-Content-Length?

If this kind of thing truly doesn't exist, what would you say is the reason that it doesn't exist yet?

Really appreciate your help!