run.py

import gradio as gr

with gr.Blocks() as demo:
    text_count = gr.State(1)
    add_btn = gr.Button("Add Box")
    add_btn.click(lambda x: x + 1, text_count, text_count)

    @gr.render(inputs=text_count)
    def render_count(count):
        boxes = []
        for i in range(count):
            box = gr.Textbox(key=i, label=f"Box {i}")
            boxes.append(box)

        def merge(*args):
            return " ".join(args)

        merge_btn.click(merge, boxes, output)

    merge_btn = gr.Button("Merge")
    output = gr.Textbox(label="Merged Output")

if __name__ == "__main__":
    demo.launch()