Can a facilitator ask for student feedback (if they can hear well, if lecture speed is too fast/slow, etc)?
Yes. Students can respond in the chat. Facilitators can see the responses in the chat. There is also a non-verbal feedback option that can be turned on in settings that students can use to provide one-click feedback without using the chat function. All users can access these options on the bottom toolbar under Reactions.
In fact, it is probably better to have students use the non-verbal feedback because it will ultimately make it easier for you to locate any specific questions students are asking and posting in the chat.