It is impossible to make an embroidery file (such as TAJIMA DST format) from a raster (bitmap) picture (for example PNG) with just some random graphics editor. This is because embroidery files are special vector based images with additional instructions for the stitching machine.
However, an experienced graphics designer might be able to create embroidery design from some image, which can be done with usually expensive digitizer software. Some embroidery software can also possess basic digitizing function that can convert raster image to embroidery, but that's usually far from perfect. In any case, this is pretty much the only way to achieve png to dst conversion.
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