timer / job / window / tab

Hi,
I am creating a timer that starts a job at a regular interval.
When the job is finished I update a variable with some of the job output with a ch_read().
I would like to update the statusline with this variable, but that means each vim process and also each tab / window have their own 'stream' of these timers and variables.
Can I start a timer for each BufReadPost,BufNewFile,FileReadPost ?
And then have a w: or t: variable for reading from each channel ?
Anyone done anything similar that has suggestions ?
thx

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