This is the link to the shiny app to implement the proposed power analysis for mixed-effects modelling (multielvel modelling, hierarchical linear modelling): https://koumurayama.shinyapps.io/summary_statistics_based_power/
The method is called summary-statistics-based power analysis. For details, please read the paper.
Note: The name of the proposed method and the shiny-app link were different in the initial draft of the manuscript, which was posted as a preprint.