diff --git a/superset/charts/schemas.py b/superset/charts/schemas.py
index 26e2470fbff6..434cd5d4b740 100644
--- a/superset/charts/schemas.py
+++ b/superset/charts/schemas.py
@@ -1735,6 +1735,7 @@ class ImportV1ChartSchema(Schema):
     viz_type = fields.String(required=True)
     params = fields.Dict()
     query_context = fields.String(allow_none=True, validate=utils.validate_json)
+    extra = fields.String(allow_none=True, validate=utils.validate_json)
     cache_timeout = fields.Integer(allow_none=True)
     uuid = fields.UUID(required=True)
     version = fields.String(required=True)
diff --git a/superset/migrations/versions/2026-06-17_16-58_9d4b2e8c1f0a_add_extra_column_to_slices.py b/superset/migrations/versions/2026-06-17_16-58_9d4b2e8c1f0a_add_extra_column_to_slices.py
new file mode 100644
index 000000000000..8fecb02cbff4
--- /dev/null
+++ b/superset/migrations/versions/2026-06-17_16-58_9d4b2e8c1f0a_add_extra_column_to_slices.py
@@ -0,0 +1,45 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""add extra column to slices
+
+Revision ID: 9d4b2e8c1f0a
+Revises: 78a40c08b4be
+Create Date: 2026-06-17 16:58:00.000000
+
+"""
+
+import sqlalchemy as sa
+
+from superset.migrations.shared.utils import add_columns, drop_columns
+from superset.utils.core import MediumText
+
+# revision identifiers, used by Alembic.
+revision = "9d4b2e8c1f0a"
+down_revision = "78a40c08b4be"
+
+
+def upgrade() -> None:
+    """Add the nullable ``extra`` column to ``slices``."""
+    add_columns(
+        "slices",
+        sa.Column("extra", MediumText(), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    """Drop the ``extra`` column from ``slices``."""
+    drop_columns("slices", "extra")
diff --git a/superset/models/slice.py b/superset/models/slice.py
index 40de049df2ab..6f978a8a7b66 100644
--- a/superset/models/slice.py
+++ b/superset/models/slice.py
@@ -82,6 +82,7 @@ class Slice(  # pylint: disable=too-many-public-methods
     viz_type = Column(String(250))
     params = Column(utils.MediumText())
     query_context = Column(utils.MediumText())
+    extra = Column(utils.MediumText())
     description = Column(Text)
     cache_timeout = Column(Integer)
     perm = Column(String(1000))
@@ -134,6 +135,7 @@ class Slice(  # pylint: disable=too-many-public-methods
         "viz_type",
         "params",
         "query_context",
+        "extra",
         "cache_timeout",
     ]
     export_parent = "table"
@@ -156,6 +158,7 @@ def clone(self) -> Slice:
             params=self.params,
             description=self.description,
             cache_timeout=self.cache_timeout,
+            extra=self.extra,
         )
 
     @renders("datasource_name")
diff --git a/tests/integration_tests/charts/commands_tests.py b/tests/integration_tests/charts/commands_tests.py
index 75d8f7d2a22f..0999e8c1c644 100644
--- a/tests/integration_tests/charts/commands_tests.py
+++ b/tests/integration_tests/charts/commands_tests.py
@@ -104,6 +104,7 @@ def test_export_chart_command(self, mock_g):
             "uuid": str(example_chart.uuid),
             "version": "1.0.0",
             "query_context": None,
+            "extra": None,
         }
 
     @patch("superset.utils.core.g")
@@ -152,6 +153,7 @@ def test_export_chart_command_key_order(self, mock_g):
             "viz_type",
             "params",
             "query_context",
+            "extra",
             "cache_timeout",
             "uuid",
             "version",