diff --git a/stdlib/experimental/iox/iox.flux b/stdlib/experimental/iox/iox.flux
index c8c3407378..5c581edcc6 100644
--- a/stdlib/experimental/iox/iox.flux
+++ b/stdlib/experimental/iox/iox.flux
@@ -12,3 +12,6 @@ package iox
 // - bucket: IOx bucket to read data from.
 // - measurement: Measurement to read data from.
 builtin from : (bucket: string, measurement: string) => stream[{A with _time: time}] where A: Record
+
+// @feature labelPolymorphism
+builtin from : (bucket: string, measurement: M) => stream[{A with _time: time}] where A: Record, M: Label
diff --git a/stdlib/experimental/mqtt/mqtt.flux b/stdlib/experimental/mqtt/mqtt.flux
index b7deb2caed..4f1df7b996 100644
--- a/stdlib/experimental/mqtt/mqtt.flux
+++ b/stdlib/experimental/mqtt/mqtt.flux
@@ -72,6 +72,27 @@ builtin to : (
     A: Record,
     B: Record
 
+// @feature labelPolymorphism
+builtin to : (
+        <-tables: stream[{ A with T: time }],
+        broker: string,
+        ?topic: string,
+        ?qos: int,
+        ?retain: bool,
+        ?clientid: string,
+        ?username: string,
+        ?password: string,
+        ?name: string,
+        ?timeout: duration,
+        ?timeColumn: T = "_time",
+        ?tagColumns: [string],
+        ?valueColumns: [string],
+    ) => stream[B]
+    where
+    A: Record,
+    B: Record,
+    T: Label
+
 // publish sends data to an MQTT broker using MQTT protocol.
 //
 // ## Parameters
diff --git a/stdlib/experimental/record/record.flux b/stdlib/experimental/record/record.flux
index b342b262fb..b7622916c1 100644
--- a/stdlib/experimental/record/record.flux
+++ b/stdlib/experimental/record/record.flux
@@ -45,3 +45,6 @@ builtin any : A where A: Record
 // introduced: 0.134.0
 //
 builtin get : (r: A, key: string, default: B) => B where A: Record
+
+// @feature labelPolymorphism
+builtin get : (r: A, key: C, default: B) => B where A: Record, C: Label
diff --git a/stdlib/influxdata/influxdb/influxdb.flux b/stdlib/influxdata/influxdb/influxdb.flux
index e1157151e8..a06b5e60a6 100644
--- a/stdlib/influxdata/influxdb/influxdb.flux
+++ b/stdlib/influxdata/influxdb/influxdb.flux
@@ -328,6 +328,26 @@ builtin to : (
     A: Record,
     B: Record
 
+// @feature labelPolymorphism
+builtin to : (
+        <-tables: stream[{ A with T: time, M: string }],
+        ?bucket: string,
+        ?bucketID: string,
+        ?org: string,
+        ?orgID: string,
+        ?host: string,
+        ?token: string,
+        ?timeColumn: T = "_time",
+        ?measurementColumn: M = "_measurement",
+        ?tagColumns: [string],
+        ?fieldFn: (r: A) => B,
+    ) => stream[{ A with T: time, M: string }]
+    where
+    A: Record,
+    B: Record,
+    T: Label,
+    M: Label
+
 // buckets returns a list of buckets in the specified organization.
 //
 // ## Parameters
diff --git a/stdlib/kafka/kafka.flux b/stdlib/kafka/kafka.flux
index 1dfc1039e9..e32dd4b136 100644
--- a/stdlib/kafka/kafka.flux
+++ b/stdlib/kafka/kafka.flux
@@ -59,3 +59,20 @@ builtin to : (
     ) => stream[A]
     where
     A: Record
+
+// @feature labelPolymorphism
+builtin to : (
+        <-tables: stream[{ A with N: string, T: time }],
+        brokers: [string],
+        topic: string,
+        ?balancer: string,
+        ?name: string,
+        ?nameColumn: N = "_measurement",
+        ?timeColumn: T = "_time",
+        ?tagColumns: [string],
+        ?valueColumns: [string],
+    ) => stream[{ A with N: string, T: time }]
+    where
+    A: Record,
+    N: Label,
+    T: Label