Exporting .PNG with maximum size in KB (not quality percentage)

Today’s update (LR Classic 8.4) includes PNG export support. Have a look at my summary of today’s new features which includes a short video on PNG export:

https://99jon.blogspot.com/2019/08/lightroom-updates-august-2019.html

simonez1112250  wrote Hi all, I need to export a lot of .PNG files with Lightroom in batch. I've already downloaded and installed the "Magic Export" plugin, so I'm able to export .PNG files with BG in transparency. I need also to have a maximum file size to respect for upload on our website (like 1000 kb) but I can't select the option in Lightroom when selecting PNG files. There is any way or plug-in that give me the opportunity to choose also the maximum file size (not the percentage of quality like 80%, but the maximum file size like 1000 kb).

As I understand things, the Magic Export plugin for PNG files has no options to control compression, which controls the file size. So, the file size is what it is. The restriction of 1000KB applied to PNG files seems like a strange thing to require; and the only way to force PNG files to be under 1000KB is to crop them (which is probably a trial-and-error process until you get the file size to be appropriate — and you may not want to crop anyway). The whole thing doesn't make sense to me.

Moved to Lightroom Classic — The desktop-focused app​