Routing a swap for ETH

Hi Uniswap Team

I am using Routing a swap doc to swap b/w to ERC20 token, but how could i use this for ETH, i do not want to use the WETH token at my end, i want that if i provide ETH in value of the route execution transaction then i get the ETH swap for the ERC20 token!!

Is this posible, if yes then how?

Thanks