Boundary construction garage - L-shaped stones under the floor slab - experiences?

Hello community,
I have a question for understanding and hope for your expert opinion.

[*]See image in attachment
[*]Our construction project plans to build a double garage on the left border to the neighbor.
[*]The property needs to be leveled so that we have to set L-bricks on the mentioned left side and thus be higher than the neighbor.
[*]Up to the L-bricks, everything must then be filled with gravel and compacted (keyword soil replacement, soil report requirement).

[*]Afterwards, a floor slab for the double garage is to be poured on this base.

Now my questions:

[*]Is it possible/safe/& sensible that the floor slab including the double garage on top is built as described on this base (concrete L-bricks and compacted gravel)?

[*]We are afraid that this won’t hold structurally or that the gravel will sink by x mm and the floor slab will crack. Is the fear justified or risk-free?

[*]Is this how it is usually built in practice as described or does it look different in practice?
[*]Do you have any other tips you would like to give us?

Thank you very much and best regards
I look forward to your feedback

UPDATE:
Hello everyone,
I have tried to create a new drawing including dimensions for better understanding. See attachment.
Furthermore, I have uploaded a photo of the property / initial situation.

In the sketch, you can see beforehand that the slope of the property has about a 1m difference. This is to be leveled to 50 cm afterwards (height of street and thus house entrance) (remove soil on the right, pile up on the left). On the left, I have to secure the piled-up soil towards the neighbors.
In general, a 1m soil replacement must be carried out according to the soil report.

I hope it comes across clearly.

I would like to have my questions 1-4 from above answered
as well as
Question 5) Advantages/Disadvantages of the L-stone variant (see drawing)
Question 6) Advantages/Disadvantages of the stone wall variant (alternative)

I was just about to say, you drew that much more beautifully in the green forum

In the picture it doesn’t look so dramatic to me how much higher the garage would have to be.

Could it be that the problem actually doesn’t exist, and only arises from wanting to have the entire property at one level in the water?

Just post the overall plan, not the garage without the house.

I have to be honest, I don’t understand where the problem is right now. Densify in layers, if uncertain possibly also with plate load test.

You are not the first to want to level the terrain along the garage wall with L-bricks. I even see that often with prefabricated garages.

We are afraid that this will not hold structurally or that the gravel will sink by x mm and the ground slab will crack. Is the fear justified or risk-free?

Then ground slabs of houses poured on frost skirts would also have to crack.

I have to be honest, I don’t understand where the problem is right now. Densify in layers, if uncertain, possibly also with plate load test.

You are not the first to want to level the ground along the garage wall with L-blocks. I even see that a lot with prefabricated garages.

Hi and thanks for the answer. Do other builders really build a floor slab on L-blocks surrounded by compacted gravel there? The first answers made me uncertain. But I can’t understand why. No one can objectively/argumentatively point out the disadvantages of this option to me. Or are there none and I can build like this?

Has anyone already built like this or laid the floor slab at the boundary?

Thanks