target_precompile_headers(PRIVATE) in library project does not work when using library functions in an executable project..

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I have never use precompiled header and I would not do it.

How will you install only our public interface header only?

Use:

target_sources(targetName
      <PRIVATE|PUBLIC|INTERFACE>
          FILE_SET setName
          [TYPE fileType]
          [BASE_DIRS dir1 [dir2...]]
          [FILES file1 [file2...]]
... )

Than your project will be much simpler and clear.

But perhaps this Include directories for target_precompile_headers may help you.