How should I add text to multiple images in an easier way

I am thinking of sending my updates via email too. I have joined mailchimp and wanna start sending my jewellery pics along with prices via mailchimp on daily basis by mail. Everyday I update all my customer's via whatsapp as I got multiple broadcast groups. Some day I send 150 pictures, someday 100, someday 200 like that but all that via whatsapp along with prices.

I want to do this via mailchimp too. Now the problem for me is adding text on daily basis to 100s of these pictures as daily I get new designs. I tried doing 1 today as a test example and it took me 3-5 hours for 150 pictures. I don't wanna waste this much time on just adding text. I need a easier and faster way of adding text to my pictures as every jewellery pricing is different. So on each and every picture I have to add say example Rs 150 or Rs 500 or Rs 200 and so on. So all these pictures should show price when customer opens up the mail. I need a easier and faster way to do that. Can anyone guide me or any suggestions for me please. Thank you for your help in advance