Extended Composer Blocks – Can I add custom posts to Lasts Posts block?

Hello!

I’m going to buy the premium Newsletter plugin to use the Extended Composer Blocks, but I don’t know if it will fit my needs. Could the Extended Composer Blocks be used to select any post I want from my wordpress and insert it on the Lasts Posts block?, so, I want to add any post I want from my web to the Lasts Posts newsletter, and also change the order.

Thanks in advance!