BufferLine configurations are not being applied - help required

[Suhas-Kalagotla]

here is my nvim configurations

I am trying to apply this settings

  let g:bufferline_active_buffer_left = '['
  let g:bufferline_active_buffer_right = ']'

but I have to source the bufferline.vim file everytime for the changes

tried to source manually by adding the following line in packer.lua but didn't work

vim.cmd('source ~/dotfiles/nvim/after/plugin/bufferline.vim')

please help me in fixing this