[tw5] Change the default title "image.png" to "timestampe.png" or "random-string.png" pasting from clipboard

I am using the tiddlywiki 5 on node.js, but require to frequently paste screenshots from other programs for notes. On node.js I can store images into a specific folder.

However, the default title is “image.png” after pasting from clipboard. I have to change it to different name, otherwise the old image will be overwrite. It would spend lots of time to change file name.

How could I config the default title “image.png” into the current timestamp or a random string?