Trying to replace a toilet’s water supply line

I'm investigating replacing my toilet's water supply line/the possibility of installing a bidet.

This is what my current supply line looks like

From what I can tell, there's no easy way to replace this type of hose without replacing the water shut off line, but I'm a bit scared to attempt that as I have no idea how difficult it is, nor do I particularly want to do it if I don't need to.

Is there a way to replace this style supply line easily, or am I going to need to replace the line + the shutoff valve?