How to append at the top/start in ImGuiTextBuffer instead of bottom/end

I'm using an ImGuiTextBuffer in ImGui to store a text buffer for my program logs.

To append text, I'm using this method:

bot_log.appendf((text + "\n").c_str());

This is more or less how it looks in my GUI:

So my idea is to see in reverse order:

File ./waypoints/gstomb.txt Loaded!

Bot loaded correctly.

How can I append to the top/start instead of the bottom/end of the buffer?