“谨以此书赠与我的爱人及未来的天使”翻译成英文。

谨以此书献给……的标准句式是this book is dedicated to... 或者the dedication of this book is...

比如《哈利波特与死圣》的献语

“The dedication of this book is split seven ways.
To Neil
To Jessica
To David
To Kenzie
To Di
To Anne
And to You
If you have stuck with Harry until the very end.”

I would like to dedicate this book to my sweetheart and my future angel.
如果说说是同一人，我建议如下翻译供您参考：

I would like to dedicate this book to my sweetheart who is an angel mean to me.

With respect, I present this book to the beloved and the future angle.

With respect, I present this book to the beloved and the future angle...希望你拟授书的人甜蜜幸福。

This book is dedicated to my beloved husband (wife) and our future angle.