Is it possible to get a dummybox's center.x, center.y, and center.z? about cadquery HOT 4 CLOSED

import cadquery as cq
from cadquery.vis import show

text_string = "CadQuery"
font = "Arial"
size = 10
text3D = cq.Workplane("XZ").text(text_string, font=font, fontsize=size, distance=2)

xlen = text3D.val().BoundingBox().xlen
ylen = text3D.val().BoundingBox().ylen
zlen = text3D.val().BoundingBox().zlen

mybox = cq.Workplane().box(xlen, ylen, zlen, centered=True).tag("dummybox").faces("<Y").tag("boxY_Negtive").end().faces("<Z").tag("boxZ_Negtive").end(2) 
mybox1 = cq.Workplane().box(xlen, ylen, zlen, centered=True)

asm = cq.Assembly(name="TextOnPanel")
asm.add(text3D, color=cq.Color(1, 0, 0), name="text3D")
asm.add(mybox, color=cq.Color(0, 0, 1), name="mybox")

text3DCenter = text3D.val().BoundingBox().center
myboxCenter = mybox1.val().BoundingBox().center

(
    asm
    .constrain("text3D@faces@>Y", "mybox?boxY_Negtive", "Axis")
    .constrain("text3D@faces@>Z[-1]", "mybox?boxZ_Negtive", "Axis")    
    .constrain("text3D", cq.Vertex.makeVertex(text3DCenter.x, text3DCenter.y, text3DCenter.z), "mybox?dummybox", cq.Vertex.makeVertex(myboxCenter.x, myboxCenter.y, myboxCenter.z), "Point") 
    #replacing "mybox?dummybox" with "mybox" could make the code work. However, dummybox is what I want.
)
asm.solve()
show(asm)

(
    asm
    .constrain("text3D@faces@>Y", "mybox?boxY_Negtive", "Axis")
    .constrain("text3D@faces@>Z[-1]", "mybox?boxZ_Negtive", "Axis")    
    .constrain("text3D", "mybox?dummybox", "Point") 
)