Default parameters from environment variable

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I always use a certain set of switches (--colors refine-added:none:background:0x33,0x66,0x33:bold --colors added:none:background:0x33,0x44,0x33 --colors refine-removed:none:background:0x66,0x33,0x33:bold --colors removed:none:background:0x44,0x33,0x33) and would like to have that whereever I invoke diffr, currently I have to always work with aliases. An environment variable for default flags as fzf has with FZF_DEFAULT_OPTS would be great.