Label Indicator

Hi everyone,

I have tried to no avail to create an indicator that will plot a string of text (user input) overlaid somewhere in the chart´s background, at one of the upper/bottom corners for instance, or ideally next to the chart´s instrument name, inside the tab (where the bar countdown is located). The only user input required is the actual text/label itself (and text size and color if plotted in the chart space). I don´t know if this is too complicated but it would be super helpful for those of us managing multiple charts. Is this something someone could help me with? I would be eternally thankful.

Thanks to all, in advance. I´m really hoping you guys can help!

Or, this could more easily be explained as a chart background watermark that can be modified by the user. Is this possible to code?