This isn't going to be all that helpful, but you'll probably want to contact Zoho Assist to check. Only they would know if their software can accept an internal CA, even if we could maintain a list of apps that work it would be an administrative nightmare to keep it up to date with vendors who can change their app at any time.
As long as the app either uses the computer's CA store or allows you to import a CA to trust, it should be fine. If the app uses client auth via a certificate, that is not supported and would need to be bypassed.
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