I have SVG image I want to add the drop shadow in SVG image path.
Open it in Adobe Illustrator, add what you need, then save it as an SVG file. Drop shadows can be problematic with SVG, however.
Considering fuzzy drop shadows are raster effects and SVG is supposed to be vector, that is more likely “will be problematic.”
If it’s a hard drop shadow created with vector shapes, shouldn’t be an issue.