Hello @Led_Wizard and welcome to the forum!
This is very well possible, but Krita does not offer post-processing for this, like many other programs do. This means, you have to set up your brushes accordingly, and you have to configure your tablet and stylus precisely to achieve it. So you need a little bit of experimentation and practice, practice, practice, to train your muscle memory for this.
In case you are painting with your mouse or another pressureless input device, you won’t be able to do this easily in Krita, in fact this is very hard. There are “workarounds”, but it is not very easy nor is it fun.
Unfortunately, you did not tell us which hardware you use to paint, because then we might be able to give you tips what to do to support you with your issue.
Additionally, you should always name the version of Krita you use and from where you got it, and of course we want to know which operating system you use, to be able to help you better.
But your question was asked several times in the forum, which you could have found using our forum-search, reachable via the magnifying-glass-symbol in the upper right of the forum.
There is even a Feature Request on this topic, and it may be a good idea to vote for that request, in order to show your interest in that feature. To cast your vote for a certain Feature Request, you will find a blue Vote-Button on the left of the topics heading (headline).
For Vector Lines, we have a similar Feature Request → Tapered Vector Lines.
Michelist