Using environment variables in *.qgs-file

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Is it possible to use an environment variable in qgis project file (*.qgs)? For example :

dbname='QBASE' host=10.1.1.1 port=5432 user=USERNAME sslmode=disable key='gid' srid=0 type=MultiPolygon table="public"."geo_zone" (geom) sql=I need set value of environment variable "USERNAME" to value of "user".



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