MathKey will do this without GoodNotes having to add the feature. Basically it is a keyboard choice that does exactly what you described. The converted handwriting becomes typeset equations like latex that are easily pasted and resized. I use it all the time without having to leave GoodNotes.

It would also be nice to draw a gif within GoodNotes. That feature would make notes come alive, and is especially useful to science and engineering students.

Paste or create live gif/png motion clips--with transparent backgrounds--within goodnotes. For example, an electric circuit diagram showing the charges moving. A page could look like a Harry Potter newspaper with moving pictures.

Also, add a motion gif with a transparent background. Like a moving stick figure.

Absolutely! This is a game changer for science teachers and students. Transparent backgrounds are important, too.

I use the MathKey app, which adds a handwriting math equation creator feature to the keyboard. It works great with GoodNotes. I create complex physics, calc and chem equations all the time on this app. Simply hand write the equation and the keyboard converts it to an equation that can be pasted as text.

Would be nice if the feature could act as a gif and play short illustration clips with transparent backgrounds without having to be clicked to start, like Facebook Messenger does.

Amen!