Combining format and style doesn't work as expected

[MindfulMinun]

Describe the bug It's impossible to combine the output of gum format with gum style. The latter overrides the styles set by the first.

To Reproduce Steps to reproduce the behavior:

gum style --border=rounded --padding="0 1" "$(gum format -t template '{{ Underline "Hello world" }}')"

Expected behavior I expected the text "Hello world" to be underlined, while also surrounded by a border.

Screenshots

Desktop (please complete the following information):

• OS: Arch Linux
• Version: gum version 0.13.0 (b0e5f32)