The short answer is that at the moment there is no way to do it. 

The long answer is that the only way to do it at the moment is a sidechain like liquid, liquid uses CT as a monero, although it does not use ring signatures because these are one of the culprits that can create hidden inflation, if hidden inflation is created then 1 L-BTC will no longer be equal to 1 BTC and the sidechain loses all credibility.