Custom commands prompt type with multiline support

Hi,

I would like to adapt the custom command [with conventional commit templates](https://github.com/jesseduffield/lazygit/wiki/Custom-Commands-Compendium#conventional-commit) to add a step for writing a multiline description.

To do this, I am looking for a [prompt type](https://github.com/jesseduffield/lazygit/blob/master/docs/Custom_Command_Keybindings.md#prompts) that could be used to input text on more than one line, like we have when committing (i.e. the prompt below the commit title).


Thanks