Copyright for various baselayer - QGIS Server

I want to add a dynamic copyright for print using QGIS Server.

Following this discussion
Dynamic copyright or layer credit in QGIS 3.4?
I find the method to add the copyright of a basemap (e.g a WMS or OSM added as XYZ tiles using QUickMapService)

layer_property( 'OSM_Standard_eae966e1_77ce_4b61_a2c0_a42854868cd3','attribution')

Nevertheless it is not dynamic. I cannot understand which layer is active (e.g. OSM_standard or OSM_HOT)