Given that's a dynamic animation, how would you want it to work? Keep swirling as the brush is moving? For a fixed time afterwards? Use the spacebar to continue animating as with watercolor?
I'm glad you asked.
In the sample provided you can freeze the fluid simulation.
Additionally Imagine if you would:
given painter's development trajectory ca. 2004 - 2020.... none of this will ever see the light of the day.
No, but I'm really tempted to see if I can make this work in Krita...