How to achieve a discount of Buy 1 get 1 50% off allowed the products in same collection group?

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I want to run the automatic discount in the two different collections.

For example.. Buy 1 get 1 50% off in 3D Puzzle collection, Buy 1 get 1 50% off in Figure collection separately.

Since Shopify allows only one automatic discount I can't create multiple rules, so I have to put both collections under the discount rule that cause the issue of separating the discount from both collections.

For example If customer add one 3d puzzle and one figure to cart, the discount applies combination of two different collections... Because shopify limits on creating multiple automatic discounts, I wonder I can achieve this by edit codes or any other suggestions? 

I hope shopify allows the multiple rules on automatic discounts at the beginning without limitation.