Seems like using execute store you cant store strings. How do I make a macro w/o it?

It seems pretty stupid, but I need to make a function that places a specific block at a... kinda fixed position. And I have the block in a string format. And I need to set the block to that block. But I... Dont know hot to set a block to another block from literally a minecraft tag in an entity. So... Any help would be appriciated. 😦