Implement this interface (diorcustomelementrenderer) but have not had any effect

Do i need add a config in plugin.xml file? Thank you.

this is my test class:

import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.EditorCustomElementRenderer;
import com.intellij.openapi.editor.Inlay;
import com.intellij.openapi.editor.colors.EditorColorsScheme;
import com.intellij.openapi.editor.colors.EditorFontType;
import com.intellij.openapi.editor.markup.TextAttributes;
import com.intellij.ui.components.JBTextArea;
import org.jetbrains.annotations.NotNull;

import java.awt.*;

public class MyInlayRendererImp implements EditorCustomElementRenderer {

    private JBTextArea textArea;
    private Color color;
    public MyInlayRendererImp(final String problemMessage, Color color) {
        textArea = new JBTextArea(problemMessage);
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        this.color = color;
    }

    @Override
    public int calcWidthInPixels(@NotNull Inlay inlay) {
        return 50;
    }

    @Override
    public int calcHeightInPixels(@NotNull Inlay inlay) {
        return 50;
    }

    @Override
    public void paint(@NotNull Inlay inlay, @NotNull Graphics graphics, @NotNull Rectangle targetRegion, @NotNull TextAttributes textAttributes) {
        Editor editor = inlay.getEditor();
        EditorColorsScheme colorsScheme = editor.getColorsScheme();

        graphics.setFont(colorsScheme.getFont(EditorFontType.PLAIN));
        graphics.setColor(color);

// todo how to draw the textArea instead of the string?
        graphics.drawString(textArea.getText(), targetRegion.x, targetRegion.y + editor.getAscent());
    }
}