Like a lot of answers already said, you will need a module for that functionality.
Our module https://commercemarketplace.adobe.com/customgento-module-configurable-tier-prices-m2.html gives you exactly this possibility.
You can then define tier prices on simple products level and our module will automatically sum up all bought children and give you the tier price, which has been defined for the simple products.
You can even decide, if the highest, the lowest or the tier price based on the respective products should be charged.
