Is this sentence correct? Tanya is a team member who holds expertise in chat support [closed]

Tanya is a team member who holds expertise in chat support.

I'm in a doubt specifically about whether it should have 'the' in place of 'a'. Feel free to notify other mistakes as well.

Solution 1:

Tanya is the team member who holds expertise in chat support very strongly suggests that Tanya is the only team member with that expertise while Tanya is a team member who holds expertise in chat support suggests that other team members may have the same expertise.

The whole sentence is a little clunky, though syntactically acceptable and (save for the/a) entirely clear. I'd prefer the simple has to holds, perhaps Tanya is the team member who has expertise in chat support.