Pumping x-forwarded-for ip into proxy protocol

Dear All,

My haproxy uses the proxy protocol on its backend side. I would like to insert an other proxy before haproxy, which only capable to add the x-forwarded-for header to carry the original client ip.

Is there any way/solution for the proxy protocol to “eat” the client ip from x-forwarded-for header coming to the frontend side?
Thank you very much