LabPlot 2.8.1 will be ready for the Microsoft store. As soon as https://binary-factory.kde.org/job/Labplot_Release_win64/ is building 2.8.1, we can publish it.
A sub task of T9575 would be a good idea.See T13860.
MS Store Submission guide: https://kate-editor.org/post/2019/2019-11-03-windows-store-submission-guide/