Selected text not clearly visible when using textmarkers

I use textmarkers to give some text a color but when the user then selects some text the selection isn’t clearly visible. In the screenshot the user typed query was correct and so it’s made green but then the user selects the word Plant but this selection isn’t very visible (see red rectangle in screenshot).

I would like the selection color to override the green color or that it sits on top of it.
How can I make the selection more visible?

You have to load and enable the mark-selection addon to force a transparent background on selected text.