I think the complexity here lies in the little innocuous word “just”.
This would include to “just” develop this feature, which “just” takes a lot of time and “just” requires website developers to be paid for the wok, and “just” keeps the SuttaCentral developer team busy with even more things, when they have already much more to do than their capacity allows … “just” this would be required.
Also, on top of this, the benefit is dubious, since there are browser extensions that handle the job quite well, which are there, ready for use, no further development work required. See for example here.