Um I have a question. So there is this website: https://flightplandatabase.com/. And it gives really good flight plans but not all of the things work so I was wondering if there is some sort of converter that I can use.
fpltoif.com is an amazing resource. Gives V-Speeds (for some aircraft’s), METAR, Distance, Duration and even adds SID and STAR (Not always down to the T but still awesome) to the flight plan automatically.
You can also use Simbrief to create your flight plan and then copy the XML file into the site that Manav suggested and it will convert any missing waypoints into longitude and latitude coordinates.