To use these templates on the reMarkable, you have to:

1. Copy both the png-, and svg-files to the /usr/share/remarkable/templates/ folder on the reMarkable, using for example WinSCP or FileZilla.

2. Edit /usr/share/remarkable/templates/templates.json by adding the following at the appropriate place according to the JSON-format (this can also be done from within WinSCP) or FileZilla.

    ,
    {
      "name": "Whitelines lines",
      "filename": "Whitelines_lines",
      "iconCode": "\ue9a8",
      "categories": [
        "Lines",
        "Custom"
      ]
    },
    {
      "name": "Whitelines squares",
      "filename": "Whitelines_squares",
      "iconCode": "\ue99e",
      "categories": [
        "Grids",
        "Custom"
      ]
    }