How to update link record from through table in Loopback4

[HarshalNathe]

I'm using the hasManyThrough relationship in my project. And I want to update the linked record that is present in through table.
For E.x. I have 3 tables
1. user
2. role
3. roleMapping
By using following code I'm able to link and unlink source & target instances.

return this.userRepository.roles(id).link(roleId); // able to link userId and roleId in roleMapping table
return this.userRepository.roles(id).unlink(roleId); // able to unlink(delete) userId and roleId from roleMapping table

Till works as expected. Now, I want to update the roleId of the target instance linked in roleMapping. table.

After linking how its get inserted into RoleMapping table. I want to update this roleId into 2

Note: I'm using MySQL as a datasource.