extract ca chain that has multiple CA as list from vault using jq and format into single ca.crt file

I trying to generate certs uisng vault pki role. How can i create a single file called ca.crt from the wget command output.

$ wget --method=POST --header="X-Vault-Namespace: ns" --header="X-Vault-Token: $VAULT_TOKEN" --body-data='{"common_name": "test.example.com", "ttl": "5m"}' https://127.0.0.1:8200/v1/pki/dev/issuing_ca/issue/dev -q -O - | jq '.data.ca_chain'Response["-----BEGIN CERTIFICATE-----\nMIIF5jCCA86W6j2PehfjWs3\nR55ogX1Z2jk/dvIIp.......Z067gh7nrDE56fzhyA=\n-----END CERTIFICATE-----","-----BEGIN CERTIFICATE-----\nMIIF4DCCA8iNzdTHItwqVl1cTglr6bcry0vckey68u+.......4gR0CRtJ\nCaLcNKCBGi/jn6pekNVvgjBamsM=\n-----END CERTIFICATE-----","-----BEGIN CERTIFICATE-----\nMIIFMzCCAxnNDE5MTlaFwumZ8\nHL8n10r0b35LtMT........CxSXIjAZJRE8Fh9jOIm0\n-----END CERTIFICATE-----"]

$ cat ca.crt-----BEGIN CERTIFICATE-----MIIF5jCCA86W6j2PehfjWs3..-----END CERTIFICATE----------BEGIN CERTIFICATE-----MIIF5jCCA86W6j2PehfjWs3..-----END CERTIFICATE----------BEGIN CERTIFICATE-----nMIIF4DCCA8iNzdTHItwqVl1c..-----END CERTIFICATE-----