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Feature Request: Add programmatic text markers with custom CSS highlighting

Feature Request: Add programmatic text markers with custom CSS highlighting: a task in LegoFlow-SWE (Harbor dataset). After the addMarker call, I expect the characters from column 5 on line 0 to column 10 on line 1 to be visually highlighted using the my-highlight-class CSS rule. Removing the…

The task

After the `addMarker` call, I expect the characters from column 5 on line 0 to column 10 on line 1 to be visually highlighted using the `my-highlight-class` CSS rule. Removing the marker should return the editor display to its original state.

Part of Lego-X/LegoFlow-SWE.