diff --git a/related/inverted_index.go b/related/inverted_index.go
index 1b1f69e3e..5502f9f11 100644
--- a/related/inverted_index.go
+++ b/related/inverted_index.go
@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/gohugoio/hugo/common/maps"
+	"github.com/spf13/cast"
 
 	"github.com/gohugoio/hugo/common/types"
 	"github.com/mitchellh/mapstructure"
@@ -283,6 +284,8 @@ func (cfg IndexConfig) ToKeywords(v any) ([]Keyword, error) {
 			vv = vc
 		}
 		keywords = append(keywords, StringsToKeywords(vv...)...)
+	case []any:
+		return cfg.ToKeywords(cast.ToStringSlice(vv))
 	case time.Time:
 		layout := "2006"
 		if cfg.Pattern != "" {
diff --git a/related/inverted_index_test.go b/related/inverted_index_test.go
index fdef06b13..7a3bd89c7 100644
--- a/related/inverted_index_test.go
+++ b/related/inverted_index_test.go
@@ -212,6 +212,19 @@ func TestToKeywordsToLower(t *testing.T) {
 	})
 }
 
+func TestToKeywordsAnySlice(t *testing.T) {
+	c := qt.New(t)
+	var config IndexConfig
+	slice := []any{"A", 32, "C"}
+	keywords, err := config.ToKeywords(slice)
+	c.Assert(err, qt.IsNil)
+	c.Assert(keywords, qt.DeepEquals, []Keyword{
+		StringKeyword("A"),
+		StringKeyword("32"),
+		StringKeyword("C"),
+	})
+}
+
 func BenchmarkRelatedNewIndex(b *testing.B) {
 	pages := make([]*testDoc, 100)
 	numkeywords := 30