How to remove background color?

Ask AI to remove the black background so that I can copy this Chinese character to any other pictures.

Prompt: Please remove the black background to become transparent. Keep the Chinese word only. Its background become tranparent. This image file is in PNG format.
to ChatGPT.

ChatGPT's answer screenshot

The downloaded image is listed below:

If the Chinese character were written on pure black background, the result would be much better.
Duplicate Chinese words on a red background image in order to test the transparent effect.