You can edit the image inside the spritefont, reduce the size of some letters. You can change their width with actions "SpriteFont Set character width".
Also, for C2 I highly recommend this addon:
https://www.construct.net/en/forum/extending-construct-2/addons-29/plugin-spritefont-69013
And SpriteFont Genearator software:
https://www.construct.net/en/forum/game-development/tools-and-resources-27/sprite-font-generator-v3-64038
Thanks you guys for the reply! The art style in my game is pixel art, so I cannot resize the letters that easily, unfortunately. But I'll try this addon, looks pretty good, thanks!