SignedXML ComputeSignature - How to InsertLineBreaks in X509Certificate base64 encoded string

I am trying to sign an XML and as part of requirement I am suppose to
insert line breaks in X509Certificate element inside Signature node

Questions is Is there a property available in SignedXML or one of it
members which once set then when we compute the signature it will add
line breaks every 76 chars for X509Certificate base 64 string?

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