There actually are some examples that would be useful to you. You can find them in the text below Allocation Situation 4 - Other situations where a policy is shared between two tax families in the Instructions for Form 8962.
According to Allocation Situation 4,
… you and the other taxpayer may agree on any allocation of the policy amounts between the two of you. You may use the percentage you agreed on for every month for which this allocation rule applies, or you may agree on different percentages for different months. However, you must use the same allocation percentage for all policy amounts (enrollment premiums, applicable SLCSP premiums, and APTC) in a month. If you cannot agree on an allocation percentage, each taxpayer’s allocation percentage is equal to the number of individuals enrolled by one taxpayer who are included in the tax family of the other taxpayer for the tax year divided by the total number of individuals enrolled in the same policy as the individual(s). The allocation percentage you use and that you put on line 30 of Form 8962 is the percentage of the policy amounts for the coverage that you will use to compute your PTC and reconcile APTC.
Please see the section cited above in the link to review the full text.
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