FiveM prop emote config [add to rpemotes or whatever emote mod you are using under the 'prop emote' category.] - [You will have to position the flashlight manually through menyoo in Singleplayer]
 
    ["gunlight"] = {
        "gunlight@animation",
        "gunlight_clip",
        "Gun & Flashlight 2",
        AnimationOptions = {
            Prop = 'prop_cs_police_torch_02',
            PropBone = 60309,
            PropPlacement = {
                0.0300,
                0.0300,
                0.0200,
               -19.0000,
               22.0000,
                9.0000
            },
            EmoteLoop = true,
            EmoteMoving = true
        }
    },

Menyoo favourite anims list:

	<Anim dict="batoncasual@animation" name="batoncasual_clip" />
	<Anim dict="gunlight@animation" name="gunlight_clip" />
	<Anim dict="gangaim2@animation" name="gangaim2_clip" />
	<Anim dict="pockets1@animation" name="pockets1_clip" />
	<Anim dict="pockets2@animation" name="pockets2_clip" />
	<Anim dict="carstop@animation" name="carstop_clip" />
	<Anim dict="batonhold@animation" name="batonhold_clip" />