JAVA EDITION
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The commands
1.Make the scoreboard - /scoreboard objectives add rightclicknpc minecraft.custom:minecraft.talked_to_villager

2. summon your villager - /summon villager ~ ~ ~ {NoGravity:1,Tags:["rightclicknpc"],NoAI:1b,Silent:1b,Invulnerable:1b,ActiveEffects:[{Id:14b,Amplifier:200b,Duration:2000000000,ShowParticles:0b}],Offers:{}}

summon your mob using generator (DONT FORGET TO ADD THE TAG, Tags:["righclicknpc2"] ) -
https://mcstacker.net/

3. REPEATING COMMAND - /execute as @e[tag=rightclicknpc2] at @s run tp @e[tag=rightclicknpc,limit=1,sort=nearest] ^ ^.1 ^.3

4. REPEATING COMMAND - /execute as @e[tag=rightclicknpc] at @s if entity @a[scores={rightclicknpc=1..},distance=..3] run INSERT COMMAND

5.CONNECT THE LAST CHAIN COMMAND TO THE REPEATING COMMAND - /scoreboard players set @a[scores={rightclicknpc=1..}] rightclicknpc 0