Adding private mortgages to credit reports

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I use very little institutional credit. I have two open accounts and five closed accounts, all good.

I use private mortgages in my investment business, and in the last few years have obtained and paid off nearly $1,000,000. These were obtained without credit checks.

Is it possible to get those onto my credit reports? What would I have to do?

My future investments will require credit checks, and my scores are held down by lack of credit activity. Thanks for your help.