How can I get the friends list of an account without their player instance?

I decided to make a game that tries to find a mutual friend between you and someone you choose, but I've run into a bit of a roadblock, in order to actually get the target friends I'm pretty sure you need their player instance, but I don't have that, is there a way to get their player instance or get their friends with just their username/userId?

-- right now all the code does is check if the user is friends with the target, but I need it to do a lot more than that
local Players = game:GetService("Players")

local player = game.Players.LocalPlayer
local targPlr = script.Parent.Parent.PlayerTextBox.Text

script.Parent.MouseButton1Down:Connect(function()
    local id
    pcall(function ()
        id = Players:GetUserIdFromNameAsync(targPlr)
    end)
    if player:IsFriendsWith(id) then

    end
end)