A separator block should been available like in WordPress to add HR line, space.
Reference:
https://wordpress.com/support/wordpress-editor/blocks/separator-block/#:~:text=If%20you%20would%20like%20to,so%20with%20the%20Separator%20block.&text=In%20order%20to%20add%20a,block%20to%20add%20one%20quickly.