Thanks for putting me “on track”. 
Although I’m familiar with the jungle of color management, I’m no metadata (and likewise database) expert.
The raw file I checked with was taken with the camera set to AdobeRGB.
all screenshots from PL 8.3.1 (Win)
In ExifTool → ExifIFD
I didn’t see (or realized) an explicit “color” entry and even no “uncalibrated”,
while the → Nikon Maker notes show “Color space = AdobeRGB”
Exports from PL8 as JPEG with “AdobeRGB (1998)”
as well as “As Shot” seem to be identical.
ExifTool -->ExifIFD then showed “Color space = uncalibrated”
and → ICC Profile “Profile description = AdobeRGB (1998)”
Export from PL8 as JPEG with “sRGB IEC61966-2.1”
ExifTool → ExifIFD then showed “Color space = sRGB”
So the last one is no embedded ICC profile, but a color tag.
Now, what’s important to me, the applications that I regularly use recognize this “sRGB” indicator correctly, i.e. FastPictureViewer and IrfanView and for editing PL as well as old PS and LR. I also have copies of FRV, FSV and AP, ON1, but use them to a much lesser extent. – And my file managers (Win 10 Explorer, Total Commander) cannot handle CM anyway.
ADDENDUM (03-22-2025)
I repeated the test with camera set to sRGB.
In ExifTool → ExifIFD I didn’t see an explicit “color” entry,
while the → Nikon Maker notes now show “Color space = sRGB”
Exports from PL8 as JPEG with “sRGB IEC61966-2.1”
as well as “As Shot” seem to be identical.
ExifTool -->ExifIFD then showed “Color space = sRGB”
note
-
Although I did not include EXIF and other metadata,
the above information was retained. -
When exporting with EXIF and metadata, all other information was retained
but made no difference in terms of color space treatment.