Prevent ChatInputBarConfiguration.TextBox from focusing on custom textBox

[weak oasis]

When I try to set ChatInputBarConfiguration.TextBox to my custom TextBox on startup, it works, but it focuses on the textbox. Players would have to click out of it in the beginning to move. How do I prevent the focusing?

I tried manually doing TextBox:ReleaseFovus(), but roblox doesn't allow that. Can't use ReleaseFocus on a designated ChatInputBarConfiguration.TextBox or whatever.