To use Proton Meet for interactive language instruction, it would be very helpful to enable the teacher to load an image and share the screen. This image could be a template of language exercises. Both the teacher and the student should then be able to annotate the text in the image, either freehand or by typing into a text box. Saving the screen as an image for later reference by the teacher and student would also be very useful. These are features that are possible in Zoom; if Proton Meet provided them, you could publicize its use for this kind of interactive teaching.