Show surroundings and a line of a interest area

No. The API accepts the geometry as an input, but does not plot it onto the image itself.

If you can use python, then perhaps have a look at rasterio.

Thanks for your quick response @batic.

My backend is in PHP and I’m using the Process API with evalscript
https://services.sentinel-hub.com/api/v1/process

Can I get the same result with this API?

The answer really depends on the tools you are using.

Using eo-learn you can see some examples for achieving this in the examples, e.g. Measuring the water level of a Theewaterskloof Dam in South Africa — eo-learn 0.9.1 documentation

If you are using QGIS, you could use the Sentinel-Hub plugin to define your satellite imagery, and have your vectors as another layer on top.

Hope that helps.