First Person Template content cannot be added to another project through the "Add Feature or Content Pack" function. This occurs in both 5.0-Early Access 2 and 4.27.1
Tested in //UE4/Release-4.26 @ CL 15973114 and this did not occur, so marking as a Regression
**The first person template content is not available to import
Content from all of the templates would be available to import
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-134840 in the post.