First of all, you do not have to continue the first ending bracket beyond the ending’s first measure.

By default the program gives you a {bracket beginning} above the ending’s first measure, and a {bracket end} above the ending’s last measure.

And that is enough.

But if you really need the bracket to continue, use the Smart Shape Tool, and add a Horizontal custom line with the same line thickness as the ending bracket.

The smart shape line will display correctly across multiple systems.

Whenever I run into this situation, I manually move the measures from the bottom of page 1 to the top of page 2, making the whole ending on one system. I think it's easier to read by doing this. The musician's eyes don't have to jump around as much.