I'm not sure if it's different on the Q6, but on my Pixel 2 XL, when I select the Export option, it default to the Download directory -- and if I tap the menu button at the upper left, I can choose Google Drive instead. Do you not have that option?
If you're only able to export the contact .vcf file to a single directory, you can always use a file manager app to move it wherever you want.
I moved this from the Android Apps forum to the General Help forum, since the former is intended for developers to promote their apps.