diff --git a/plot/annotation.v b/plot/annotation.v
index fb932b673..9b44f6044 100644
--- a/plot/annotation.v
+++ b/plot/annotation.v
@@ -5,10 +5,10 @@ pub struct Annotation {
 pub mut:
 	x          f64
 	y          f64
-	text       string
-	showarrow  bool
-	arrowhead  int
-	arrowcolor string = 'black'
-	align      string = 'center'
+	text       string [omitempty]
+	showarrow  bool   [omitempty]
+	arrowhead  int    [omitempty]
+	arrowcolor string [omitempty]
+	align      string [omitempty]
 	font       Font
 }
diff --git a/plot/scripts/plotter.py b/plot/scripts/plotter.py
index 40e255e1d..df9c1febb 100644
--- a/plot/scripts/plotter.py
+++ b/plot/scripts/plotter.py
@@ -84,11 +84,6 @@ def process_trace(trace):
 
     trace = remove_empty_keys(trace)
 
-    if trace_type == 'pie':
-        if "marker" in trace:
-            trace["marker"].pop("opacity")
-            trace["marker"].pop("colorscale")
-
     return map_trace_type_to_plotly_object(trace_type)(trace)
 
 
diff --git a/plot/trace.v b/plot/trace.v
index e0e4a9695..a1be4a50c 100644
--- a/plot/trace.v
+++ b/plot/trace.v
@@ -20,36 +20,36 @@ pub mut:
 	x             XType
 	xbins         map[string]f32
 	y             []f64
-	z             ZType
-	values        []f64
-	labels        []string
-	text          []string
-	customdata    [][]string
-	name          string
-	mode          string
-	marker        Marker
-	line          Line
-	pull          []f64
-	hole          f64
-	colorscale    string = 'Viridis'
-	hovertemplate string
-	textinfo      string
-	fill          string
-	fillcolor     string
+	z             ZType          [omitempty]
+	values        []f64          [omitempty]
+	labels        []string       [omitempty]
+	text          []string       [omitempty]
+	customdata    [][]string     [omitempty]
+	name          string         [omitempty]
+	mode          string         [omitempty]
+	marker        Marker         [omitempty]
+	line          Line           [omitempty]
+	pull          []f64          [omitempty]
+	hole          f64            [omitempty]
+	colorscale    string         [omitempty] = 'Viridis'
+	hovertemplate string         [omitempty]
+	textinfo      string         [omitempty]
+	fill          string         [omitempty]
+	fillcolor     string         [omitempty]
 }
 
 pub struct Marker {
 pub mut:
-	size       []f64
-	color      []string
-	opacity    f64    = 0.8
-	colorscale string = 'Viridis'
+	size       []f64    [omitempty]
+	color      []string [omitempty]
+	opacity    f64      [omitempty]
+	colorscale string   [omitempty]
 }
 
 pub struct Line {
 pub mut:
-	color string
-	width f64 = 2.0
+	color string [omitempty]
+	width f64    [omitempty] = 2.0
 	// check Plotly docs for more dash types
 	dash string = 'solid'
 }