The SVG path usually looks like a solid line:
Is it possible to implement a hand-drawing (crayon) style for SVG path?
You can try something like this using svg
's filter
<svg width="1000" height="500">
<defs>
<filter id="filter" height="2" width="2">
<feTurbulence baseFrequency="0.2" numOctaves="3" type="fractalNoise" />
<feDisplacementMap scale="80" xChannelSelector="R" in="SourceGraphic" />
</filter>
</defs>
<path d="m 100 100 l 200 10" stroke="black" stroke-width="20" style="filter:url(#filter)"/>