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This extension was created using ~~Rush~~

Here is a video of how I did it

Create block


 
  @SimpleFunction(description = "Allows you to set a Labels Text to Selectable(see picture below) so the user can Copy the Text from the Label.If selectAllOnFocus = true, all of the Label’s Text will be highlighted.If selectAllOnFocus = false, only the word that was selected will be highlighted.")
    public void SetTextIsSelectable(final Label label, final boolean selectAllOnFocus) {
        final TextView textView = (TextView)label.getView();
        textView.setTextIsSelectable(true);
        textView.setSelectAllOnFocus(selectAllOnFocus);
    }


 
 @SimpleFunction(description = "Allows you to set the highlight color for the selected text.")
    public void SetHighlightColor(final Label label, final Object getColor) {
        ((TextView)label.getView()).setHighlightColor(getColorInt(getColor));
    }



  
  
  @SimpleFunction(description = "Allows you to set the space between lines. Standard is 1.")
    public void SetLineSpacing(final Label label, final float setLineSpacing) {
        ((TextView)label.getView()).setLineSpacing(0.0f, setLineSpacing);
    }

Open source


  
  package com.sgview.labeltools;

import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.errors.YailRuntimeError;
import com.google.appinventor.components.runtime.util.YailList;

import android.widget.TextView;
import com.google.appinventor.components.runtime.Label;
import gnu.math.IntNum;
import android.graphics.Color;
import com.google.appinventor.components.common.ComponentCategory;

public class LabelTools extends AndroidNonvisibleComponent {
 private ComponentContainer container;
  public LabelTools(ComponentContainer container) {  
    super(container.$form());
    this.container = container;
  }

  public static int getColorInt(final Object o) {
        if (o instanceof String) {
            return Color.parseColor((String)o);
        }
        return ((IntNum)o).intValue();
    }
    
    @SimpleFunction(description = "Allows you to set the highlight color for the selected text.")
    public void SetHighlightColor(final Label label, final Object getColor) {
        ((TextView)label.getView()).setHighlightColor(getColorInt(getColor));
    }
    
    @SimpleFunction(description = "Allows you to set the space between lines. Standard is 1.")
    public void SetLineSpacing(final Label label, final float setLineSpacing) {
        ((TextView)label.getView()).setLineSpacing(0.0f, setLineSpacing);
    }
    
    @SimpleFunction(description = "Allows you to set a Labels Text to Selectable(see picture below) so the user can Copy the Text from the Label.If selectAllOnFocus = true, all of the Label’s Text will be highlighted.If selectAllOnFocus = false, only the word that was selected will be highlighted.")
    public void SetTextIsSelectable(final Label label, final boolean selectAllOnFocus) {
        final TextView textView = (TextView)label.getView();
        textView.setTextIsSelectable(true);
        textView.setSelectAllOnFocus(selectAllOnFocus);
    }
}