Yes, it's possible. See example below. Made with SH3D; took me about 5 minutes.... Original file is included.
Based on the phrasing of your question, I think this is not what you mean (but it IS what Google Images thinks a garden archway looks like). So, I made a several more garden archways that might be closer to what you are looking for. Except for the "invisible box", all parts are standard SH3D parts that you can find in the models section.
Emmanuel, if you read this, please note the shadow of the invisible box on the left. It shouldn't be there, but maybe it's because that box is grouped with the arch above it.
Hans