KDE Optional Packages

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The services.desktopManager.plasma6.enable NixOS Option currently does install KDE Plasma and some other KDE Applications, but some optional packages are missing

For example, KDE Spectacle is missing the optional tesseract and its language data packages dependencies

Spectacle Text Recognition (OCR) : "Missing Required Packages: - Tesseract; -Tesseract language data (e.g. tesseract-ocr-english for English)"
Spectacle Text Recognition (OCR) : "Missing Required Packages: - Tesseract; -Tesseract language data (e.g. tesseract-ocr-english for English)"1920×1530 675 KB

I haven’t found any option on NixOS, Home Manager, or plasma-manager to enable optional packages to install, nor any documentation about it (while the environment.plasma6.excludePackages NixOS option exists)

For now, it seems that one needs to install each optional packages manually (i.e. using environment.systemPackages)

Do you think optional packages options like .enableOcr for KDE Spectacle, or even a general enableOptionalFeatures option would be great additions?