Hi Artur,
Your d="M462..." string is basically a set of instructions to move a virtual "pen" to draw a series of straight-line sections to make up a polygon. The "M" and "L" parts of the string are commands which tell the "pen" where to go and what to do; so
instructs the "pen" to Move to the point (462, 399), and
instructs the "pen" to draw a straight Line from the previous point (462, 399) to the point (454, 405), and so on, until the "z" command tells the system to close the path. For more information on those commands see e.g.
SVG Paths So, you will note that the coordinates given ((462, 399), (454, 405), etc.) are all simple integer values which represent (I'm guessing here) pixel coordinates in the "leaflet-interactive" component where you got the code you posted. In other words, these integer values IN NO WAY represent lat/long coordinates, and so - unless you can convert somehow between pixels-to-lat/long values in the original (Leaflet?) component - you will not be able to use the values in your string to create a polygon at the correct position in the map using the Google maps API.
Best regards,
Rob