Is there a way to write Hebrew letters in a text object? I can't write Hebrew directly. I also tried to copy and paste letters with "Ctrl + v" but to no avail. Is there any way to do that?
I am not sure I understand your question correctly, I can only test it by c&p because I don't have a hebrew keyboard layout.
But i have downloaded a hebrew font here and pasted it into Blender https://alefalefalef.co.il/en/resources/
And was able to insert hebrew characters . see screenshot.
Kind regards Sebastian