Readymade minced soya kheema is available in the market. You can use that too instead of whole soya chunks.
If you want. One beaten egg can be poured over the soya kheema, once you spread it over dosa.
Soya kheema filling can be made and stored in fridge upto 3 to 4 days.
You can make small dosa or big as per your choice.
Cook the dosa on low heat so it gets cooked evenly.