This is correct, as you have already processed the individual's anatomy with FreeSurfer, what you describe will provide the 300Parcels_7Networks for this individual subject.
The steps I mentioned describe how to process the default anatomy so the 300Parcels_7Networks scout atlas will be available in the Default anatomy.
So, it mostly depends where (which cortex) connectivity is computed.
The simple way to import these annot files is to stored them in the label directory of the resulting files from MRI segmentation with FreeSurfer, then import the anatomy into Brainstorm. The annot files will be automatically detected and imported, more over, this atlas ( 300Parcels_7Networks) will be available for all the other cortical surfaces (e.g, surfaces with less vertices).
If you do now want (or cannot) reimport the anatomy, it is needed to import manually these annot files. Keep in mind that these annot files (L and R) are indices that make references to the full resolution cortical surfaces (L and R, with around 150K vertices each) obtained from FreeSurfer. As you, you need to:
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Import the Left hemisphere in Brainstorm.
Right-click on the Subject, then Import surface , use FreeSurfer file type and select the file (e.g.lh.pial) -
If asked about apply the same transformation to surfaces, answer Yes.
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Double-click the imported surface (e.g. lh.pial)
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Go to the Scout label, then Atlas > Load atlas, select the FreeSurder atlas (*.annot) file type, and select the left annot:
lh.Schaefer2018_300Parcels_7Networks.annot -
Close the figure with the surface.
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Repeat steps 1 to 5 for the right hemisphere files.
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Lastly, merge those surface. Select them both, then right-click Merge surface. Double-click the new cortex file, and check the scouts in the Scout tab.
Please note that this atlas will be available for the newly imported surface.