Until there is a proper implementation, I found a workaround to get the exact percentage.
1, Select the object which you applied gradient on.
2, Export it as a SVG
3, check out SVG XML and you will find similar lines to these:
<linearGradient id="linear-gradient" x1="0.5" x2="0.5" y2="1" gradientUnits="objectBoundingBox">
<stop offset="0" stop-color="red"/>
<stop offset="0.456" stop-color="blue"/>
<stop offset="1" stop-color="green"/>
</linearGradient>
Until there is a proper implementation, I found a workaround to get the exact percentage.
1, Select the object which you applied gradient on.
2, Export it as a SVG
3, check out SVG XML and you will find similar lines to these:
<linearGradient id="linear-gradient" x1="0.5" x2="0.5" y2="1" gradientUnits="objectBoundingBox">
<stop offset="0" stop-color="red"/>
<stop offset="0.456" stop-color="blue"/>
<stop offset="1" stop-color="green"/>
</linearGradient>
4. Offset property equals to percentage in css
Maybe it will be handy for someone :)