Can we export canvas image with a transparent background?

the canvas is really powerful. I use it to organize my video script. I found it will be super useful if the output image (PNG) can be with a transparent background. so it can be easily used in the video clips as illustrative menus, words, etc, a transparent bg wil make it easy to fit in other video clips,instead of a colored bg block the way if i use other video as background.
now I can do this with other video editor ,just some tool to erase the background of the obsiidian output image ,but the effect is not good, the main content will also lost a liitle bit.
thanks guys!