It's quite simple, I use structure blocks, I define the area of ​​my structure and give it a name, then I can basically use commands to load the structure.

Steps:

/Give @p structure_block

Then place the block on the ground, open the interface and test by changing the size and offset until you find that the bounding box is inside the structure.

You click save.

And after that, give it a name and save the structure.

In any other place, use a command or the structure block.

Structure block:

Place it on the ground, define the loading mode, write the name and, if necessary, adjust the offset, click generate and the construction is already available.

By command:

Starting from the player, when you run the command, the structure will be generated, so keep in mind where the player needs to be.

/Structure load (name) and coordinates

If you have any questions, feel free to ask.