Dear Soof,
Sorry. I just discover your message now. If you only use gdal through QGIS, there is a solution.
To apply the command line I provided, you can do this:
1) In the gdal toolbox, select "Translate (Convert Format)".
2) As input layer, add the "DIM_<datasetname>.XML" file related to your Pléiades image.
3) In Advanced parameters, for Profile, select "No compression"
4) For Converted (=output file), specify the path and name of your geotiff image.
5) Check the command line it creates in GDAL/OGR console call
6) Run the conversion.
Repeat for each Pléiades image you would like to process with Metashape.
To build pyramid overviews, as suggested by Alexey, the tool is also available through the GDAL toolbox in QGIS (Build overviews (pyramids)).
All the best,
Benoît