Currently, the only way to achieve this is to change the pak files which a lot of people don't want to do, because it can mess with your game, and also because riot client repairs it after you close the game, so you have to keep changing the pak files every time you want to play valorant. It's entirely possible to have say japanese or korean or hindi voice lines, while still having all the text be english, riot just seems to not care about providing that option.

Is this something riot might consider implementing?