How to burn confidential assets or pegged bitcoin on Bitcoin Liquid sidechain I used to burn bitcoin sending to a bogus address like 1111111111111111111114oLvT2

There is any equivalent confidential address for Elements/Liquid?
destroyamount is the rpc call you are looking for

https://github.com/Blockstream/liquid/blob/3f937d39f7c516e49f62d05c12d41b63b79ca043/src/wallet/rpcwallet.cpp#L586