Oh wow.I did it! Not exactly i wanted but it works😀

fps=1.0/thisComp.frameDuration;

temp = thisComp.layer(“Text_Suchbegriff”).text.sourceText;

frameInterval = 3;

f = timeToFrames(time-1.5)

k = fps * frameInterval;

x = temp.length;

y = 100/x

s = y/2

value = (f*s)/frameInterval