Export file with a number of file name as watermark

Using lightroom classic latest version on windows, is there a way to export a series of photos, and use either the file name, or a sequence number as a large watermark in the middle of images?  I need to post 100+ photos to an online gallery and the viewer can choose which one they need to print, the gallery doesn't show filename or anything so I need a way for the viewer to tell me which images they want to print.  If it is not built into LR, any third party tool I can run after to put file name as watermark?