Dear Future Husband

Dear Future Husband,

I will cook. I will clean. I will shop. I will be the best home maker, ever, inshya Allah..

I will dress up for you, I will maintain my appearance for you. I will make sure to be the best wife I can be, inshya Allah..
...
I will have as many children as you want. I will raise your children to be the best they can be. I will be the best mother, inshya Allah..

As long as you promise me one thing: take me to Jannah..

The post means that the woman will obey and love her husband in all that he asks of her and she will do it happily..
The conditions of this love and commitment from her side is based on his piety and dedication to Allah and how well he practises his Deen..
If he is high in Imaan that would therefore help her in her own Deen and therefore help her to attain Jannah..
The post speaks of a man who will help his wife be closer to Allah because of his love and dedication to Islam..