ᐅ Pre-fabricated basement – Filling in corners

Hello, we have built a prefabricated basement and I plan to start the plastering work eventually. I have a question about the internal and external corners:

How would you plaster the internal corners (the typical room corners)? Currently, they are filled with foam. Would you embed a corner bead here or just seal it with acrylic?

We also have an external corner. The concrete wall is chamfered here. Are there corner beads designed for embedding in this case?

Thanks in advance for your answers.