Copyable math formulas

I'm curious whether there is a package that allows to copy math formulas correctly.

For example, this one should highlight like so

but, not like so

And if I copy one, I should get:

∫₃⁵ (x/(1-x²)) dx

If there is no such a package, I'm looking for an any manual way of doing this.

For example, I can make a phantom text to make the selection highlight correct. But I don't know how to get custom text by copying.