diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d4ce0b3ebf..01364a3220a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ Changelog for NeoFS Node
 - Support of verified domains for the storage nodes (#2280)
 - `neofs-lens storage status` CLI command (#2550)
 - Human-readable output of objects' creation timestamp to `neofs-cli container list-objects` (#2653)
+- Ability to preset P2PNotary and NeoFSAlphabet roles to validators at the FS chain's genesis (#2643)
 
 ### Fixed
 - `neofs-cli netmap netinfo` documentation (#2555)
diff --git a/config/example/ir.yaml b/config/example/ir.yaml
index 82884e99801..337e461c432 100644
--- a/config/example/ir.yaml
+++ b/config/example/ir.yaml
@@ -83,6 +83,9 @@ morph:
       ping: # Optional settings of pinging mechanism
         interval: 30s # Optional time period between pings. Defaults to 30s. Must not be negative
         timeout: 90s # Optional time period to wait for pong. Defaults to 1m. Must not be negative
+    set_roles_in_genesis: true # Optional flag for designating P2PNotary and NeoFSAlphabet roles to all
+      # genesis block validators. The validators depend on 'committee' and, if set, 'validators_history'.
+      # Must be 'true' or 'false'.
 
 fschain_autodeploy: true # Optional flag to run auto-deployment procedure of the FS chain. By default,
   # the chain is expected to be deployed/updated in the background (e.g. via NeoFS ADM tool).
diff --git a/pkg/innerring/config.go b/pkg/innerring/config.go
index 4f212a4add0..2926b6f8314 100644
--- a/pkg/innerring/config.go
+++ b/pkg/innerring/config.go
@@ -218,6 +218,11 @@ func parseBlockchainConfig(v *viper.Viper, _logger *zap.Logger) (c blockchain.Co
 		}
 	}
 
+	c.SetRolesInGenesis, err = parseConfigBool(v, rootSection+".set_roles_in_genesis", "flag to set roles for the committee in the genesis block")
+	if err != nil && !errors.Is(err, errMissingConfig) {
+		return c, err
+	}
+
 	c.Logger = _logger
 
 	return c, nil
diff --git a/pkg/innerring/config_test.go b/pkg/innerring/config_test.go
index 0d79cab9d62..1638058ec0d 100644
--- a/pkg/innerring/config_test.go
+++ b/pkg/innerring/config_test.go
@@ -67,6 +67,7 @@ const validBlockchainConfigOptions = `
       ping:
         interval: 44s
         timeout: 55s
+    set_roles_in_genesis: true
 `
 
 func _newConfigFromYAML(tb testing.TB, yaml1, yaml2 string) *viper.Viper {
@@ -199,6 +200,7 @@ func TestParseBlockchainConfig(t *testing.T) {
 				4:  1,
 				12: 4,
 			},
+			SetRolesInGenesis: true,
 		}, c)
 	})
 
@@ -280,6 +282,11 @@ func TestParseBlockchainConfig(t *testing.T) {
 			{kvF("p2p.peers.max", math.MaxInt32+1)},
 			{kvF("p2p.peers.attempts", -1)},
 			{kvF("p2p.peers.attempts", math.MaxInt32+1)},
+			{kvF("set_roles_in_genesis", "not a boolean")},
+			{kvF("set_roles_in_genesis", 1)},
+			{kvF("set_roles_in_genesis", "True")},
+			{kvF("set_roles_in_genesis", "False")},
+			{kvF("set_roles_in_genesis", "not a boolean")},
 		} {
 			var reportMsg []string
 
diff --git a/pkg/innerring/internal/blockchain/blockchain.go b/pkg/innerring/internal/blockchain/blockchain.go
index 24087f8af78..1165b8a6fe1 100644
--- a/pkg/innerring/internal/blockchain/blockchain.go
+++ b/pkg/innerring/internal/blockchain/blockchain.go
@@ -12,6 +12,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/consensus"
 	"github.com/nspcc-dev/neo-go/pkg/core"
+	"github.com/nspcc-dev/neo-go/pkg/core/native/noderoles"
 	"github.com/nspcc-dev/neo-go/pkg/core/storage"
 	"github.com/nspcc-dev/neo-go/pkg/core/storage/dbconfig"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
@@ -239,6 +240,13 @@ type Config struct {
 	// must not exceed Committee length. Value for zero key (genesis height) is
 	// required.
 	ValidatorsHistory map[uint32]uint32
+
+	// Whether to designate [noderoles.P2PNotary] and [noderoles.NeoFSAlphabet]
+	// roles to the Committee (keep an eye on ValidatorsHistory) for genesis block
+	// in the RoleManagement contract.
+	//
+	// Optional: by default, roles are unset.
+	SetRolesInGenesis bool
 }
 
 // New returns new Blockchain configured by the specified Config. New panics if
@@ -350,6 +358,16 @@ func New(cfg Config) (res *Blockchain, err error) {
 		cfgBaseProto.ValidatorsCount = uint32(len(standByCommittee))
 	}
 
+	if cfg.SetRolesInGenesis {
+		// note that ValidatorsHistory or ValidatorsCount field must be set above
+		genesisValidatorsCount := cfgBaseProto.GetNumOfCNs(0)
+		cfgBaseProto.Genesis.Roles = map[noderoles.Role]keys.PublicKeys{
+			// Notary service is always enabled, see below
+			noderoles.P2PNotary:     cfg.Committee[:genesisValidatorsCount],
+			noderoles.NeoFSAlphabet: cfg.Committee[:genesisValidatorsCount],
+		}
+	}
+
 	cfgBaseApp := &cfgBase.ApplicationConfiguration
 	cfgBaseApp.Relay = true
 	cfgBaseApp.Consensus.Enabled = true