By the way, Coinjoin will be available in the next release 
Although it's not as intuitive as Wasabi's, in Electrum it will be a painstaking manual merging of transactions and distribution of partially signed merged transaction to the other parties.

Here's one testnet transaction that I've tried: fe3dde593d428606aab307bc11a179fbfacb416176865d1f7d14276fc25ce597
(merged inputs and outputs from three different wallet types)