Precompose without losing expression references?

how precompose layer has expressions linked main comp layers without losing connection?

 

i assume frequent enough of issue there solution it. in fact, in view should built-in after effects.

 

for reason can't find asking question -- less answering -- googling, here go.

 

is issue can solved scripting (relatively easily)?

to clarify, looking scripting solution obviate manual linking. moved expressions forum, i'm not asking how reconnect expressions manually, rather if there script, or if such can made, can use precompose layer (or set of layers) while retaining expression references layers outside precomp.

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