Hi Hans,
Welcome.
At present there isn’t a direct export of Navigraph Charts flight plan to SimBrief.
You can copy from the Type route facility and paste into a created SimBrief plan.
We shall consider such integration for a future release.
See also:
Simbrief or Navigraph? and
How to combine two flight plans ( SimBrief & Navigraph ) and
Cut , copy and paste route
Cheers
Ian