Why doesn't Martha have an XYZ form?

So I was wondering if they have like a lore reason or if just not out or what because tbh I don't know the archetype lore, but I noticed all the main deck monsters have and XYZ that looks like a powered up version of them except Martha, so I was wondering why? I noticed that there gonna get a Structure deck, so maybe that foreshadows more cards for them but still.

Also in case I need it this is where I got the image: https://www.deviantart.com/rosatmaker/art/Exosister-Martha-948925684

Hopefully that url works, also sorry if I flared this wrong or am asking in the wrong place.

So I was wondering if they have like a lore reason or if just not out or what because tbh I don't know the archetype lore, but I noticed all the main deck monsters have and XYZ that looks like a powered up version of them except Martha, so I was wondering why? I noticed that there gonna get a Structure deck, so maybe that foreshadows more cards for them but still.

Also in case I need it this is where I got the image: https://www.deviantart.com/rosatmaker/art/Exosister-Martha-948925684

Hopefully that url works, also sorry if I flared this wrong or am asking in the wrong place.