To use SVG in Overleaf or LaTeX without \usepackage{svg} convert SVG to EPS or PNG as below. This may be needed for some journals that don’t allows using extra packages like svg.

SVG to EPS

inkscape -E out.eps in.svg

gives vector graphics conversion at full quality from the command line (no GUI).

Imagemagick doesn’t seem to be able to do this (Imagemagick makes gigantic raster EPS), but Inkscape does the vector SVG to EPS conversion well.

SVG to PNG

You can also convert SVG to PNG (raster) with

inkscape -e out.png in.svg

See man inkscape for more options e.g. to select PNG resolution.