termux-get-session-text - Getting visible session screen content and store it to the clipboard/file

Feature description
I have some web pages to which I would like to copy an URL. However the URL is displayed in the frame (elinks browser when = key is pressed), so the URL cannot be extracted with the native termux URL extractor. Ideally I could open another session and from the script I could get the visible text from the initial session:

# bash script content
text=$(termux-get-session-text $1)
extract_URL.pl "$text"

Parameter to the termux-get-session-text would be the session index.

Reference implementation

In the xfce4-terminal there is an option to select whole terminal visible text. Then the code of termux-clipboard-get could get the selected text.

Start by examining the existing termux-clipboard-get code and the proposed termux-get-session-text command, then compare the reference behavior described for xfce4-terminal. Define how a session index selects the visible session content and verify that the result can be passed to a script or stored in the clipboard/file.